Stéradian — Wikipédia

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class="vector-toc-link" href="#Utilisation"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Utilisation</span> </div> </a> <ul id="toc-Utilisation-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Exemples" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Exemples"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Exemples</span> </div> </a> <ul id="toc-Exemples-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Autre_unité_d'angle_solide" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Autre_unité_d'angle_solide"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Autre unité d'angle solide</span> </div> </a> <ul id="toc-Autre_unité_d'angle_solide-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Formules_sur_la_lumière" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Formules_sur_la_lumière"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Formules sur la lumière</span> </div> </a> <ul id="toc-Formules_sur_la_lumière-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Notes_et_références" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Notes_et_références"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Notes et références</span> </div> </a> <ul id="toc-Notes_et_références-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Voir_aussi" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Voir_aussi"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>Voir aussi</span> </div> </a> <button aria-controls="toc-Voir_aussi-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Afficher / masquer la sous-section Voir aussi</span> </button> <ul id="toc-Voir_aussi-sublist" class="vector-toc-list"> <li id="toc-Bibliographie" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Bibliographie"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.1</span> <span>Bibliographie</span> </div> </a> <ul id="toc-Bibliographie-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Articles_connexes" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Articles_connexes"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.2</span> <span>Articles connexes</span> </div> </a> <ul id="toc-Articles_connexes-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Liens_externes" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Liens_externes"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.3</span> <span>Liens externes</span> </div> </a> <ul id="toc-Liens_externes-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Sommaire" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Basculer la table des matières" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Basculer la table des matières</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Stéradian</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Aller à un article dans une autre langue. Disponible en 71 langues." > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-71" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">71 langues</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Steradiaal" title="Steradiaal – afrikaans" lang="af" hreflang="af" data-title="Steradiaal" data-language-autonym="Afrikaans" data-language-local-name="afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%B3%D8%AA%D8%B1%D8%A7%D8%AF%D9%8A%D8%A7%D9%86" title="ستراديان – arabe" lang="ar" hreflang="ar" data-title="ستراديان" data-language-autonym="العربية" data-language-local-name="arabe" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Estereorradi%C3%A1n" title="Estereorradián – asturien" lang="ast" hreflang="ast" data-title="Estereorradián" data-language-autonym="Asturianu" data-language-local-name="asturien" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%A1%D1%82%D1%8D%D1%80%D0%B0%D0%B4%D1%8B%D1%8F%D0%BD" title="Стэрадыян – biélorusse" lang="be" hreflang="be" data-title="Стэрадыян" data-language-autonym="Беларуская" data-language-local-name="biélorusse" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-be-x-old mw-list-item"><a href="https://be-tarask.wikipedia.org/wiki/%D0%A1%D1%82%D1%8D%D1%80%D0%B0%D0%B4%D1%8B%D1%8F%D0%BD" title="Стэрадыян – Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Стэрадыян" data-language-autonym="Беларуская (тарашкевіца)" data-language-local-name="Belarusian (Taraškievica orthography)" class="interlanguage-link-target"><span>Беларуская (тарашкевіца)</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%A1%D1%82%D0%B5%D1%80%D0%B0%D0%B4%D0%B8%D0%B0%D0%BD" title="Стерадиан – bulgare" lang="bg" hreflang="bg" data-title="Стерадиан" data-language-autonym="Български" data-language-local-name="bulgare" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%B8%E0%A7%8D%E0%A6%9F%E0%A7%87%E0%A6%B0%E0%A7%87%E0%A6%A1%E0%A6%BF%E0%A6%AF%E0%A6%BC%E0%A6%BE%E0%A6%A8" title="স্টেরেডিয়ান – bengali" lang="bn" hreflang="bn" data-title="স্টেরেডিয়ান" data-language-autonym="বাংলা" data-language-local-name="bengali" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-bo mw-list-item"><a href="https://bo.wikipedia.org/wiki/%E0%BD%9F%E0%BE%B3%E0%BD%B4%E0%BD%98%E0%BC%8B%E0%BD%84%E0%BD%BC%E0%BD%A6%E0%BC%8B%E0%BD%9A%E0%BD%91%E0%BC%8D" title="ཟླུམ་ངོས་ཚད། – tibétain" lang="bo" hreflang="bo" data-title="ཟླུམ་ངོས་ཚད།" data-language-autonym="བོད་ཡིག" data-language-local-name="tibétain" class="interlanguage-link-target"><span>བོད་ཡིག</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Estereoradian" title="Estereoradian – catalan" lang="ca" hreflang="ca" data-title="Estereoradian" data-language-autonym="Català" data-language-local-name="catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%D8%B3%D8%AA%D8%B1%D8%A7%D8%AF%DB%8C%D8%A7%D9%86" title="سترادیان – sorani" lang="ckb" hreflang="ckb" data-title="سترادیان" data-language-autonym="کوردی" data-language-local-name="sorani" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Steradi%C3%A1n" title="Steradián – tchèque" lang="cs" hreflang="cs" data-title="Steradián" data-language-autonym="Čeština" data-language-local-name="tchèque" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-cv mw-list-item"><a href="https://cv.wikipedia.org/wiki/%D0%A1%D1%82%D0%B5%D1%80%D0%B0%D0%B4%D0%B8%D0%B0%D0%BD" title="Стерадиан – tchouvache" lang="cv" hreflang="cv" data-title="Стерадиан" data-language-autonym="Чӑвашла" data-language-local-name="tchouvache" class="interlanguage-link-target"><span>Чӑвашла</span></a></li><li class="interlanguage-link interwiki-cy mw-list-item"><a href="https://cy.wikipedia.org/wiki/Steradian" title="Steradian – gallois" lang="cy" hreflang="cy" data-title="Steradian" data-language-autonym="Cymraeg" data-language-local-name="gallois" class="interlanguage-link-target"><span>Cymraeg</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Steradian" title="Steradian – danois" lang="da" hreflang="da" data-title="Steradian" data-language-autonym="Dansk" data-language-local-name="danois" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Steradiant" title="Steradiant – allemand" lang="de" hreflang="de" data-title="Steradiant" data-language-autonym="Deutsch" data-language-local-name="allemand" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%A3%CF%84%CE%B5%CF%81%CE%B1%CE%BA%CF%84%CE%AF%CE%BD%CE%B9%CE%BF" title="Στερακτίνιο – grec" lang="el" hreflang="el" data-title="Στερακτίνιο" data-language-autonym="Ελληνικά" data-language-local-name="grec" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Steradian" title="Steradian – anglais" lang="en" hreflang="en" data-title="Steradian" data-language-autonym="English" data-language-local-name="anglais" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Steradiano" title="Steradiano – espéranto" lang="eo" hreflang="eo" data-title="Steradiano" data-language-autonym="Esperanto" data-language-local-name="espéranto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Estereorradi%C3%A1n" title="Estereorradián – espagnol" lang="es" hreflang="es" data-title="Estereorradián" data-language-autonym="Español" data-language-local-name="espagnol" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Steradiaan" title="Steradiaan – estonien" lang="et" hreflang="et" data-title="Steradiaan" data-language-autonym="Eesti" data-language-local-name="estonien" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Estereorradian" title="Estereorradian – basque" lang="eu" hreflang="eu" data-title="Estereorradian" data-language-autonym="Euskara" data-language-local-name="basque" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%A7%D8%B3%D8%AA%D8%B1%D8%A7%D8%AF%DB%8C%D8%A7%D9%86" title="استرادیان – persan" lang="fa" hreflang="fa" data-title="استرادیان" data-language-autonym="فارسی" data-language-local-name="persan" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Steradiaani" title="Steradiaani – finnois" lang="fi" hreflang="fi" data-title="Steradiaani" data-language-autonym="Suomi" data-language-local-name="finnois" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Stearaidian" title="Stearaidian – irlandais" lang="ga" hreflang="ga" data-title="Stearaidian" data-language-autonym="Gaeilge" data-language-local-name="irlandais" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Estereorradi%C3%A1n" title="Estereorradián – galicien" lang="gl" hreflang="gl" data-title="Estereorradián" data-language-autonym="Galego" data-language-local-name="galicien" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%A1%D7%98%D7%A8%D7%93%D7%99%D7%90%D7%9F" title="סטרדיאן – hébreu" lang="he" hreflang="he" data-title="סטרדיאן" data-language-autonym="עברית" data-language-local-name="hébreu" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%B8%E0%A5%8D%E0%A4%9F%E0%A5%87%E0%A4%B0%E0%A5%87%E0%A4%A1%E0%A4%BF%E0%A4%AF%E0%A4%A8" title="स्टेरेडियन – hindi" lang="hi" hreflang="hi" data-title="स्टेरेडियन" data-language-autonym="हिन्दी" data-language-local-name="hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Steradijan" title="Steradijan – croate" lang="hr" hreflang="hr" data-title="Steradijan" data-language-autonym="Hrvatski" data-language-local-name="croate" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Szteradi%C3%A1n" title="Szteradián – hongrois" lang="hu" hreflang="hu" data-title="Szteradián" data-language-autonym="Magyar" data-language-local-name="hongrois" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%8D%D5%BF%D5%A5%D5%BC%D5%A1%D5%A4%D5%AB%D5%A1%D5%B6" title="Ստեռադիան – arménien" lang="hy" hreflang="hy" data-title="Ստեռադիան" data-language-autonym="Հայերեն" data-language-local-name="arménien" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-ia mw-list-item"><a href="https://ia.wikipedia.org/wiki/Steradiano" title="Steradiano – interlingua" lang="ia" hreflang="ia" data-title="Steradiano" data-language-autonym="Interlingua" data-language-local-name="interlingua" class="interlanguage-link-target"><span>Interlingua</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Steradian" title="Steradian – indonésien" lang="id" hreflang="id" data-title="Steradian" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonésien" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Steradiante" title="Steradiante – italien" lang="it" hreflang="it" data-title="Steradiante" data-language-autonym="Italiano" data-language-local-name="italien" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%82%B9%E3%83%86%E3%83%A9%E3%82%B8%E3%82%A2%E3%83%B3" title="ステラジアン – japonais" lang="ja" hreflang="ja" data-title="ステラジアン" data-language-autonym="日本語" data-language-local-name="japonais" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%A1%E1%83%A2%E1%83%94%E1%83%A0%E1%83%90%E1%83%93%E1%83%98%E1%83%90%E1%83%9C%E1%83%98" title="სტერადიანი – géorgien" lang="ka" hreflang="ka" data-title="სტერადიანი" data-language-autonym="ქართული" data-language-local-name="géorgien" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%A1%D1%82%D0%B5%D1%80%D0%B0%D0%B4%D0%B8%D0%B0%D0%BD" title="Стерадиан – kazakh" lang="kk" hreflang="kk" data-title="Стерадиан" data-language-autonym="Қазақша" data-language-local-name="kazakh" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%8A%A4%ED%85%8C%EB%9D%BC%EB%94%94%EC%95%88" title="스테라디안 – coréen" lang="ko" hreflang="ko" data-title="스테라디안" data-language-autonym="한국어" data-language-local-name="coréen" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-lb mw-list-item"><a href="https://lb.wikipedia.org/wiki/Steradiant" title="Steradiant – luxembourgeois" lang="lb" hreflang="lb" data-title="Steradiant" data-language-autonym="Lëtzebuergesch" data-language-local-name="luxembourgeois" class="interlanguage-link-target"><span>Lëtzebuergesch</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Steradianas" title="Steradianas – lituanien" lang="lt" hreflang="lt" data-title="Steradianas" data-language-autonym="Lietuvių" data-language-local-name="lituanien" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Steradi%C4%81ns" title="Steradiāns – letton" lang="lv" hreflang="lv" data-title="Steradiāns" data-language-autonym="Latviešu" data-language-local-name="letton" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%A1%D1%82%D0%B5%D1%80%D0%B0%D0%B4%D0%B8%D1%98%D0%B0%D0%BD" title="Стерадијан – macédonien" lang="mk" hreflang="mk" data-title="Стерадијан" data-language-autonym="Македонски" data-language-local-name="macédonien" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%B8%E0%B5%8D%E0%B4%B1%E0%B5%8D%E0%B4%B1%E0%B5%86%E0%B4%B1%E0%B4%BE%E0%B4%A1%E0%B4%BF%E0%B4%AF%E0%B5%BB" title="സ്റ്റെറാഡിയൻ – malayalam" lang="ml" hreflang="ml" data-title="സ്റ്റെറാഡിയൻ" data-language-autonym="മലയാളം" data-language-local-name="malayalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-mn mw-list-item"><a href="https://mn.wikipedia.org/wiki/%D0%A1%D1%82%D0%B5%D1%80%D0%B0%D0%B4%D0%B8%D0%B0%D0%BD" title="Стерадиан – mongol" lang="mn" hreflang="mn" data-title="Стерадиан" data-language-autonym="Монгол" data-language-local-name="mongol" class="interlanguage-link-target"><span>Монгол</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Steradian" title="Steradian – malais" lang="ms" hreflang="ms" data-title="Steradian" data-language-autonym="Bahasa Melayu" data-language-local-name="malais" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Steradiaal" title="Steradiaal – néerlandais" lang="nl" hreflang="nl" data-title="Steradiaal" data-language-autonym="Nederlands" data-language-local-name="néerlandais" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Steradian" title="Steradian – norvégien nynorsk" lang="nn" hreflang="nn" data-title="Steradian" data-language-autonym="Norsk nynorsk" data-language-local-name="norvégien nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Steradian" title="Steradian – norvégien bokmål" lang="nb" hreflang="nb" data-title="Steradian" data-language-autonym="Norsk bokmål" data-language-local-name="norvégien bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-oc mw-list-item"><a href="https://oc.wikipedia.org/wiki/Estereoradian" title="Estereoradian – occitan" lang="oc" hreflang="oc" data-title="Estereoradian" data-language-autonym="Occitan" data-language-local-name="occitan" class="interlanguage-link-target"><span>Occitan</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Steradian" title="Steradian – polonais" lang="pl" hreflang="pl" data-title="Steradian" data-language-autonym="Polski" data-language-local-name="polonais" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pms mw-list-item"><a href="https://pms.wikipedia.org/wiki/Sterajant" title="Sterajant – piémontais" lang="pms" hreflang="pms" data-title="Sterajant" data-language-autonym="Piemontèis" data-language-local-name="piémontais" class="interlanguage-link-target"><span>Piemontèis</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Esferorradiano" title="Esferorradiano – portugais" lang="pt" hreflang="pt" data-title="Esferorradiano" data-language-autonym="Português" data-language-local-name="portugais" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Steradian" title="Steradian – roumain" lang="ro" hreflang="ro" data-title="Steradian" data-language-autonym="Română" data-language-local-name="roumain" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%A1%D1%82%D0%B5%D1%80%D0%B0%D0%B4%D0%B8%D0%B0%D0%BD" title="Стерадиан – russe" lang="ru" hreflang="ru" data-title="Стерадиан" data-language-autonym="Русский" data-language-local-name="russe" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-scn mw-list-item"><a href="https://scn.wikipedia.org/wiki/Steradianti" title="Steradianti – sicilien" lang="scn" hreflang="scn" data-title="Steradianti" data-language-autonym="Sicilianu" data-language-local-name="sicilien" class="interlanguage-link-target"><span>Sicilianu</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Steradijan" title="Steradijan – serbo-croate" lang="sh" hreflang="sh" data-title="Steradijan" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="serbo-croate" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-si mw-list-item"><a href="https://si.wikipedia.org/wiki/%E0%B7%83%E0%B7%8A%E0%B6%A7%E0%B7%8A%E2%80%8D%E0%B6%BB%E0%B7%9A%E0%B6%A9%E0%B7%92%E0%B6%BA%E0%B6%B1%E0%B6%BA" title="ස්ට්‍රේඩියනය – cingalais" lang="si" hreflang="si" data-title="ස්ට්‍රේඩියනය" data-language-autonym="සිංහල" data-language-local-name="cingalais" class="interlanguage-link-target"><span>සිංහල</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Steradian" title="Steradian – Simple English" lang="en-simple" hreflang="en-simple" data-title="Steradian" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Steradi%C3%A1n" title="Steradián – slovaque" lang="sk" hreflang="sk" data-title="Steradián" data-language-autonym="Slovenčina" data-language-local-name="slovaque" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Steradian" title="Steradian – slovène" lang="sl" hreflang="sl" data-title="Steradian" data-language-autonym="Slovenščina" data-language-local-name="slovène" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%A1%D1%82%D0%B5%D1%80%D0%B0%D0%B4%D0%B8%D1%98%D0%B0%D0%BD" title="Стерадијан – serbe" lang="sr" hreflang="sr" data-title="Стерадијан" data-language-autonym="Српски / srpski" data-language-local-name="serbe" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Steradian" title="Steradian – suédois" lang="sv" hreflang="sv" data-title="Steradian" data-language-autonym="Svenska" data-language-local-name="suédois" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%A4%E0%AE%BF%E0%AE%A3%E0%AF%8D%E0%AE%AE%E0%AE%B5%E0%AE%BE%E0%AE%B0%E0%AF%88%E0%AE%AF%E0%AE%A9%E0%AF%8D" title="திண்மவாரையன் – tamoul" lang="ta" hreflang="ta" data-title="திண்மவாரையன்" data-language-autonym="தமிழ்" data-language-local-name="tamoul" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%AA%E0%B9%80%E0%B8%95%E0%B8%AD%E0%B9%80%E0%B8%A3%E0%B9%80%E0%B8%94%E0%B8%B5%E0%B8%A2%E0%B8%99" title="สเตอเรเดียน – thaï" lang="th" hreflang="th" data-title="สเตอเรเดียน" data-language-autonym="ไทย" data-language-local-name="thaï" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Steradyan" title="Steradyan – turc" lang="tr" hreflang="tr" data-title="Steradyan" data-language-autonym="Türkçe" data-language-local-name="turc" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%A1%D1%82%D0%B5%D1%80%D0%B0%D0%B4%D1%96%D0%B0%D0%BD" title="Стерадіан – ukrainien" lang="uk" hreflang="uk" data-title="Стерадіан" data-language-autonym="Українська" data-language-local-name="ukrainien" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/%D8%B3%D9%B9%D8%B1%DB%8C%DA%88%DB%8C%D9%86" title="سٹریڈین – ourdou" lang="ur" hreflang="ur" data-title="سٹریڈین" data-language-autonym="اردو" data-language-local-name="ourdou" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Steradian" title="Steradian – ouzbek" lang="uz" hreflang="uz" data-title="Steradian" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="ouzbek" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Steradian" title="Steradian – vietnamien" lang="vi" hreflang="vi" data-title="Steradian" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamien" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E7%90%83%E9%9D%A2%E5%BA%A6" title="球面度 – wu" lang="wuu" hreflang="wuu" data-title="球面度" data-language-autonym="吴语" data-language-local-name="wu" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E7%90%83%E9%9D%A2%E5%BA%A6" title="球面度 – chinois" lang="zh" hreflang="zh" data-title="球面度" data-language-autonym="中文" data-language-local-name="chinois" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E7%90%83%E9%9D%A2%E5%BA%A6" title="球面度 – cantonais" lang="yue" hreflang="yue" data-title="球面度" data-language-autonym="粵語" data-language-local-name="cantonais" class="interlanguage-link-target"><span>粵語</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q177612#sitelinks-wikipedia" title="Modifier les liens interlangues" class="wbc-editpage">Modifier les liens</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav 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href="/wiki/Projet:Accueil" title="Projet:Accueil">projets correspondants</a>. </p><p>Consultez la liste des <b>tâches à accomplir</b> en <a href="/wiki/Discussion:St%C3%A9radian" title="Discussion:Stéradian">page de discussion</a>. </p> </div></div> <p class="mw-empty-elt"> </p> <table class="infobox_v2 infobox infobox--frwiki noarchive"> <tbody><tr> <td colspan="2" class="entete defaut" style="background-color:#E1E1E1;color:black;">Stéradian </td></tr> <tr><td colspan="2" style="text-align:center; line-height: 1.5em;"><span typeof="mw:File/Frameless"><a href="/w/index.php?title=Fichier:Steradian.svg&lang=fr" class="mw-file-description"><img alt="Représentation d'un angle solide valant 1 stéradian." src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Steradian.svg/langfr-280px-Steradian.svg.png" decoding="async" width="280" height="280" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Steradian.svg/langfr-420px-Steradian.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Steradian.svg/langfr-560px-Steradian.svg.png 2x" data-file-width="433" data-file-height="433" /></a></span> <br />Représentation d'un angle solide valant 1 stéradian. </td></tr> <tr> <th colspan="2" style="padding:4px; text-align:center; background-color:#E1E1E1; color:#000000">Informations</th></tr> <tr> <th scope="row"><a href="/wiki/Syst%C3%A8me_d%27unit%C3%A9s" title="Système d'unités">Système</a> </th> <td><a href="/wiki/Unit%C3%A9s_d%C3%A9riv%C3%A9es_du_Syst%C3%A8me_international" class="mw-redirect" title="Unités dérivées du Système international">Unités dérivées du Système international</a> </td> </tr> <tr> <th scope="row">Unité de…</th> <td><a href="/wiki/Angle_solide" title="Angle solide">Angle solide</a></td> </tr> <tr> <th scope="row">Symbole</th> <td>sr</td> </tr> <tr> <td class="navigation-only" colspan="2" style="border-top: 2px #AAAAAA solid; font-size: 80%; background:inherit; text-align: right;"><span class="plainlinks" style="float:left;"><a class="external text" href="https://fr.wikipedia.org/w/index.php?title=St%C3%A9radian&action=edit&section=0"><span class="infodoc">modifier</span></a></span> <span typeof="mw:File"><a href="/wiki/Mod%C3%A8le:Infobox_Unit%C3%A9" title="Consultez la documentation du modèle"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/38/Info_Simple.svg/12px-Info_Simple.svg.png" decoding="async" width="12" height="12" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/38/Info_Simple.svg/18px-Info_Simple.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/38/Info_Simple.svg/24px-Info_Simple.svg.png 2x" data-file-width="512" data-file-height="512" /></a></span></td> </tr> </tbody></table> <p>Le <b>stéradian</b> (symbole : <b>sr</b>) est l'<a href="/wiki/Unit%C3%A9_de_mesure" title="Unité de mesure">unité de mesure</a> des <a href="/wiki/Angle_solide" title="Angle solide">angles solides</a> dans le <a href="/wiki/Syst%C3%A8me_international_d%27unit%C3%A9s" title="Système international d'unités">Système international</a>. Son nom est partiellement dérivé du <a href="/wiki/Grec_ancien" title="Grec ancien">grec ancien</a> <span class="lang-grc" lang="grc">στερεός</span> / <span class="lang-grc-latn" lang="grc-latn"><i>stereós</i></span>, « solide, dur, cubique ». </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Définition"><span id="D.C3.A9finition"></span>Définition</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=St%C3%A9radian&veaction=edit&section=1" title="Modifier la section : Définition" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=St%C3%A9radian&action=edit&section=1" title="Modifier le code source de la section : Définition"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div><p> Le <a href="/wiki/Bureau_international_des_poids_et_mesures" title="Bureau international des poids et mesures">Bureau international des poids et mesures</a> (BIPM) définit le stéradian comme suit : </p><blockquote> <p>« Le stéradian est l'unité cohérente d'<a href="/wiki/Angle_solide" title="Angle solide">angle solide</a>. Un stéradian est un angle solide d'un <a href="/wiki/C%C3%B4ne_(g%C3%A9om%C3%A9trie)" title="Cône (géométrie)">cône</a> qui, ayant son <a href="/wiki/Sommet_(g%C3%A9om%C3%A9trie)" title="Sommet (géométrie)">sommet</a> au <a href="/wiki/Centre_(g%C3%A9om%C3%A9trie)" title="Centre (géométrie)">centre</a> d'une <a href="/wiki/Sph%C3%A8re" title="Sphère">sphère</a>, découpe sur la surface de cette sphère une <a href="/wiki/Aire_(g%C3%A9om%C3%A9trie)" title="Aire (géométrie)">aire</a> égale à celle d'un <a href="/wiki/Carr%C3%A9" title="Carré">carré</a> ayant pour <a href="/wiki/C%C3%B4t%C3%A9" class="mw-disambig" title="Côté">côté</a> une <a href="/wiki/Longueur" title="Longueur">longueur</a> égale au <a href="/wiki/Rayon_(g%C3%A9om%C3%A9trie)" title="Rayon (géométrie)">rayon</a> de la sphère. »<sup id="cite_ref-BIPM201926<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>,_<span_class="nowrap">tableau_4</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="note(s)"_>n.</abbr>&nbsp;(c)</span>_1-0" class="reference"><a href="#cite_note-BIPM201926<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>,_<span_class="nowrap">tableau_4</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="note(s)"_>n.</abbr>&nbsp;(c)</span>-1"><span class="cite_crochet">[</span>1<span class="cite_crochet">]</span></a></sup> </p> </blockquote><p> Sa définition française officielle est : </p><blockquote> <p>« L’unité d’angle solide est le stéradian, angle solide d’un cône qui, ayant son sommet au centre d’une sphère, découpe sur la surface de cette sphère une aire égale à celle d’un carré ayant pour côté une longueur égale au rayon de la sphère<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite_crochet">[</span>2<span class="cite_crochet">]</span></a></sup>. » </p> </blockquote> <p>Autrement dit, un angle solide de 1 stéradian délimite sur une sphère de rayon 1, à partir du centre de cette sphère, une surface d'aire 1. L'angle solide qui intercepte la sphère entière vaut donc 4π stéradians puisque l'aire d'une sphère de rayon <i>r</i> vaut <span class="nowrap">4π <i>r</i><sup>2</sup></span>. </p><p>Le stéradian est une des vingt-deux unités dérivées<sup id="cite_ref-BIPM201925<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.3</span>_3-0" class="reference"><a href="#cite_note-BIPM201925<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.3</span>-3"><span class="cite_crochet">[</span>3<span class="cite_crochet">]</span></a></sup> cohérentes<sup id="cite_ref-BIPM201925<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>_4-0" class="reference"><a href="#cite_note-BIPM201925<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>-4"><span class="cite_crochet">[</span>4<span class="cite_crochet">]</span></a></sup> ayant un nom spécial et un symbole particulier<sup id="cite_ref-BIPM201926<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>,_<span_class="nowrap">tableau_4</span>,_''<abbr_class="abbr_"_title="sub_verbo_(«_à_l'article_»)"_>s.v.</abbr>''_angle_solide_5-0" class="reference"><a href="#cite_note-BIPM201926<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>,_<span_class="nowrap">tableau_4</span>,_''<abbr_class="abbr_"_title="sub_verbo_(«_à_l'article_»)"_>s.v.</abbr>''_angle_solide-5"><span class="cite_crochet">[</span>5<span class="cite_crochet">]</span></a></sup>. </p><p>Le stéradian (sr) est une <a href="/wiki/Unit%C3%A9_d%C3%A9riv%C3%A9e_du_Syst%C3%A8me_international" title="Unité dérivée du Système international">unité dérivée</a> du <a href="/wiki/M%C3%A8tre" title="Mètre">mètre</a> (m)<sup id="cite_ref-LNE201922<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;3</span>,_<span_class="nowrap">section_<abbr_class="abbr_"_title="2"_><span_class="romain"_style="text-transform:uppercase">II</span></abbr></span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2</span>_6-0" class="reference"><a href="#cite_note-LNE201922<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;3</span>,_<span_class="nowrap">section_<abbr_class="abbr_"_title="2"_><span_class="romain"_style="text-transform:uppercase">II</span></abbr></span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2</span>-6"><span class="cite_crochet">[</span>6<span class="cite_crochet">]</span></a></sup>. Son expression, en <a href="/wiki/Unit%C3%A9s_de_base_du_Syst%C3%A8me_international" title="Unités de base du Système international">unités de base</a>, est sr = m<sup>2</sup>⋅m<sup>–2</sup><sup id="cite_ref-BIPM201926<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>,_<span_class="nowrap">tableau_4</span>,_''<abbr_class="abbr_"_title="sub_verbo_(«_à_l'article_»)"_>s.v.</abbr>''_angle_solide_5-1" class="reference"><a href="#cite_note-BIPM201926<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>,_<span_class="nowrap">tableau_4</span>,_''<abbr_class="abbr_"_title="sub_verbo_(«_à_l'article_»)"_>s.v.</abbr>''_angle_solide-5"><span class="cite_crochet">[</span>5<span class="cite_crochet">]</span></a></sup><sup class="reference cite_virgule">,</sup><sup id="cite_ref-LNE201922<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;3</span>,_<span_class="nowrap">section_<abbr_class="abbr"_title="2"><span_class="romain"_style="text-transform:uppercase">II</span></abbr></span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2</span>,_<span_class="nowrap">tableau_2</span>,_''<abbr_class="abbr_"_title="sub_verbo_(«_à_l'article_»)"_>s.v.</abbr>''_angle_solide_7-0" class="reference"><a href="#cite_note-LNE201922<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;3</span>,_<span_class="nowrap">section_<abbr_class="abbr"_title="2"><span_class="romain"_style="text-transform:uppercase">II</span></abbr></span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2</span>,_<span_class="nowrap">tableau_2</span>,_''<abbr_class="abbr_"_title="sub_verbo_(«_à_l'article_»)"_>s.v.</abbr>''_angle_solide-7"><span class="cite_crochet">[</span>7<span class="cite_crochet">]</span></a></sup>. Il est ainsi une unité <a href="/wiki/Analyse_dimensionnelle" title="Analyse dimensionnelle">sans dimension</a><sup id="cite_ref-NoirotParisotBrouillet2019218annexes,_A.1,_''<abbr_class="abbr_"_title="sub_verbo_(«_à_l'article_»)"_>s.v.</abbr>''_équations_aux_dimensions_8-0" class="reference"><a href="#cite_note-NoirotParisotBrouillet2019218annexes,_A.1,_''<abbr_class="abbr_"_title="sub_verbo_(«_à_l'article_»)"_>s.v.</abbr>''_équations_aux_dimensions-8"><span class="cite_crochet">[</span>8<span class="cite_crochet">]</span></a></sup>. </p><p>En 1995, la <abbr class="abbr" title="Vingtième">20<sup>e</sup></abbr> conférence générale du BIPM supprime la classe des unités supplémentaires ; le <a href="/wiki/Radian" title="Radian">radian</a> et le stéradian perdent leur statut singulier d'« unités supplémentaires » et sont désormais considérés comme des unités dérivées, « sans dimension dont les noms et les symboles peuvent être utilisés, mais pas nécessairement, dans les expressions d'autres unités dérivées SI, suivant les besoins »<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite_crochet">[</span>9<span class="cite_crochet">]</span></a></sup>. </p> <div class="mw-heading mw-heading2"><h2 id="Utilisation">Utilisation</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=St%C3%A9radian&veaction=edit&section=2" title="Modifier la section : Utilisation" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=St%C3%A9radian&action=edit&section=2" title="Modifier le code source de la section : Utilisation"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Le stéradian est utilisé en <a href="/wiki/Radiom%C3%A9trie" title="Radiométrie">radiométrie</a><sup id="cite_ref-BIPM201925<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.3</span>_3-1" class="reference"><a href="#cite_note-BIPM201925<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.3</span>-3"><span class="cite_crochet">[</span>3<span class="cite_crochet">]</span></a></sup> et en <a href="/wiki/Photom%C3%A9trie_(optique)" title="Photométrie (optique)">photométrie</a><sup id="cite_ref-BIPM201925<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.3</span>_3-2" class="reference"><a href="#cite_note-BIPM201925<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.3</span>-3"><span class="cite_crochet">[</span>3<span class="cite_crochet">]</span></a></sup><sup class="reference cite_virgule">,</sup><sup id="cite_ref-BIPM201927<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>,_<span_class="nowrap">tableau_4</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="note(s)"_>n.</abbr>&nbsp;(g)</span>_10-0" class="reference"><a href="#cite_note-BIPM201927<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>,_<span_class="nowrap">tableau_4</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="note(s)"_>n.</abbr>&nbsp;(g)</span>-10"><span class="cite_crochet">[</span>10<span class="cite_crochet">]</span></a></sup>. L'<a href="/wiki/Intensit%C3%A9_%C3%A9nerg%C3%A9tique_(physique)" title="Intensité énergétique (physique)">intensité énergétique</a> s'exprime en <a href="/wiki/Watt_par_st%C3%A9radian" title="Watt par stéradian">watt par stéradian</a><sup id="cite_ref-BIPM201928<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>,_<span_class="nowrap">tableau_6</span>,_''<abbr_class="abbr_"_title="sub_verbo_(«_à_l'article_»)"_>s.v.</abbr>''_intensité_énergétique_11-0" class="reference"><a href="#cite_note-BIPM201928<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>,_<span_class="nowrap">tableau_6</span>,_''<abbr_class="abbr_"_title="sub_verbo_(«_à_l'article_»)"_>s.v.</abbr>''_intensité_énergétique-11"><span class="cite_crochet">[</span>11<span class="cite_crochet">]</span></a></sup> ; et la <a href="/wiki/Luminance_%C3%A9nerg%C3%A9tique" title="Luminance énergétique">luminance énergétique</a>, en watt par mètre carré stéradian<sup id="cite_ref-BIPM201928<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>,_<span_class="nowrap">tableau_6</span>,_''<abbr_class="abbr_"_title="sub_verbo_(«_à_l'article_»)"_>s.v.</abbr>''_luminance_énergétique_12-0" class="reference"><a href="#cite_note-BIPM201928<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>,_<span_class="nowrap">tableau_6</span>,_''<abbr_class="abbr_"_title="sub_verbo_(«_à_l'article_»)"_>s.v.</abbr>''_luminance_énergétique-12"><span class="cite_crochet">[</span>12<span class="cite_crochet">]</span></a></sup>. </p> <div class="mw-heading mw-heading2"><h2 id="Exemples">Exemples</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=St%C3%A9radian&veaction=edit&section=3" title="Modifier la section : Exemples" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=St%C3%A9radian&action=edit&section=3" title="Modifier le code source de la section : Exemples"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>Le regard d'un <a href="/wiki/%C5%92il" title="Œil">œil</a> humain embrasse environ 2π <abbr class="abbr" title="stéradian">sr</abbr><sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite_crochet">[</span>13<span class="cite_crochet">]</span></a></sup> ;</li> <li>Un <a href="/wiki/C%C3%B4ne_(g%C3%A9om%C3%A9trie)" title="Cône (géométrie)">cône</a> circulaire, de demi-angle au sommet <i>θ</i> découpe dans l'espace un angle solide de 2π (1 - cos<i>θ</i>) stéradians. Un exemple concret permet d'illustrer la relation entre un angle solide (dans l'espace) et l'angle au sommet correspondant (angle usuel dans un plan): Si on met en rotation un <a href="/wiki/Angle_plan" title="Angle plan">angle plan</a> (2<i>θ</i>) de <span title="65,546 372°" style="cursor:help">1,144</span> radian (65,54°) autour de sa <a href="/wiki/Bissectrice" title="Bissectrice">bissectrice</a>, il engendre un cône qui définit un angle solide de 1 stéradian.</li></ul> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fichier:AngleSolide.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3a/AngleSolide.svg/220px-AngleSolide.svg.png" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3a/AngleSolide.svg/330px-AngleSolide.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3a/AngleSolide.svg/440px-AngleSolide.svg.png 2x" data-file-width="800" data-file-height="600" /></a><figcaption><a href="/wiki/Relation" class="mw-disambig" title="Relation">Relation</a> d'angle plan à angle solide.</figcaption></figure> <ul><li>On peut montrer que le <a href="/wiki/Patron_(g%C3%A9om%C3%A9trie)" title="Patron (géométrie)">développement</a> d'un cône circulaire correspondant à un stéradian fait environ 195°<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite_crochet">[</span>14<span class="cite_crochet">]</span></a></sup>.</li></ul> <div class="mw-heading mw-heading2"><h2 id="Autre_unité_d'angle_solide"><span id="Autre_unit.C3.A9_d.27angle_solide"></span>Autre unité d'angle solide</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=St%C3%A9radian&veaction=edit&section=4" title="Modifier la section : Autre unité d'angle solide" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=St%C3%A9radian&action=edit&section=4" title="Modifier le code source de la section : Autre unité d'angle solide"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Le <a href="/wiki/Degr%C3%A9_carr%C3%A9" title="Degré carré">degré carré</a>, de symbole deg<sup>2</sup>, est une autre <a href="/wiki/Unit%C3%A9_d%27angle_solide" title="Unité d'angle solide">unité d'angle solide</a>. Elle ne fait pas partie du système international d'unités. </p><p>La conversion entre degré carré et stéradian est : <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \mathrm {1\;deg^{2}=\left({\frac {\pi }{180}}\right)^{2}\;sr} }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> <mspace width="thickmathspace" /> <mi mathvariant="normal">d</mi> <mi mathvariant="normal">e</mi> <msup> <mi mathvariant="normal">g</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mo>=</mo> <msup> <mrow> <mo>(</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mi>π</mi> <mn>180</mn> </mfrac> </mrow> <mo>)</mo> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mspace width="thickmathspace" /> <mi mathvariant="normal">s</mi> <mi mathvariant="normal">r</mi> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \mathrm {1\;deg^{2}=\left({\frac {\pi }{180}}\right)^{2}\;sr} }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/62731f89eee8f8c1ccdf0a7b5f871e0fe073a914" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.838ex; width:20.074ex; height:5.176ex;" alt="{\displaystyle \mathrm {1\;deg^{2}=\left({\frac {\pi }{180}}\right)^{2}\;sr} }"></span> </p><p>Il en résulte que l'angle solide d'une sphère complète est : </p><p><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \mathrm {4\pi \;sr=4\pi \left({\frac {180}{\pi }}\right)^{2}deg^{2}={\frac {360^{2}}{\pi }}deg^{2}={\frac {129\,600}{\pi }}deg^{2}\approx 41\,253\;deg^{2}} }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mn>4</mn> <mi>π</mi> <mspace width="thickmathspace" /> <mi mathvariant="normal">s</mi> <mi mathvariant="normal">r</mi> <mo>=</mo> <mn>4</mn> <mi>π</mi> <msup> <mrow> <mo>(</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>180</mn> <mi>π</mi> </mfrac> </mrow> <mo>)</mo> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mi mathvariant="normal">d</mi> <mi mathvariant="normal">e</mi> <msup> <mi mathvariant="normal">g</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <msup> <mn>360</mn> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mi>π</mi> </mfrac> </mrow> <mi mathvariant="normal">d</mi> <mi mathvariant="normal">e</mi> <msup> <mi mathvariant="normal">g</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mn>129</mn> <mspace width="thinmathspace" /> <mn>600</mn> </mrow> <mi>π</mi> </mfrac> </mrow> <mi mathvariant="normal">d</mi> <mi mathvariant="normal">e</mi> <msup> <mi mathvariant="normal">g</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mo>≈</mo> <mn>41</mn> <mspace width="thinmathspace" /> <mn>253</mn> <mspace width="thickmathspace" /> <mi mathvariant="normal">d</mi> <mi mathvariant="normal">e</mi> <msup> <mi mathvariant="normal">g</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \mathrm {4\pi \;sr=4\pi \left({\frac {180}{\pi }}\right)^{2}deg^{2}={\frac {360^{2}}{\pi }}deg^{2}={\frac {129\,600}{\pi }}deg^{2}\approx 41\,253\;deg^{2}} }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/67d0306b27b0fc7f0cf5b11a198f136abdd13e2d" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.505ex; width:67.241ex; height:6.509ex;" alt="{\displaystyle \mathrm {4\pi \;sr=4\pi \left({\frac {180}{\pi }}\right)^{2}deg^{2}={\frac {360^{2}}{\pi }}deg^{2}={\frac {129\,600}{\pi }}deg^{2}\approx 41\,253\;deg^{2}} }"></span> </p> <div class="mw-heading mw-heading2"><h2 id="Formules_sur_la_lumière"><span id="Formules_sur_la_lumi.C3.A8re"></span>Formules sur la lumière</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=St%C3%A9radian&veaction=edit&section=5" title="Modifier la section : Formules sur la lumière" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=St%C3%A9radian&action=edit&section=5" title="Modifier le code source de la section : Formules sur la lumière"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="bandeau-container bandeau-section metadata bandeau-niveau-information"><div class="bandeau-cell bandeau-icone-css loupe">Article connexe : <a href="/wiki/Photom%C3%A9trie_(optique)" title="Photométrie (optique)">Photométrie</a>.</div></div> <p>Le <a href="/wiki/Lumen_(unit%C3%A9)" title="Lumen (unité)">lumen</a> est l'unité de <a href="/wiki/Flux_lumineux" title="Flux lumineux">flux lumineux</a> correspondant au flux émis par une source d'une <a href="/wiki/Intensit%C3%A9_lumineuse" title="Intensité lumineuse">intensité lumineuse</a> de 1 <a href="/wiki/Candela" title="Candela">candela</a> contenu dans un <a href="/wiki/Angle_solide" title="Angle solide">angle solide</a> de 1 stéradian. </p><p>Expressions contenant le stéradian : </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \mathrm {1\,lm=1\,cd\cdot 1\,sr} }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> <mspace width="thinmathspace" /> <mi mathvariant="normal">l</mi> <mi mathvariant="normal">m</mi> <mo>=</mo> <mn>1</mn> <mspace width="thinmathspace" /> <mi mathvariant="normal">c</mi> <mi mathvariant="normal">d</mi> <mo>⋅</mo> <mn>1</mn> <mspace width="thinmathspace" /> <mi mathvariant="normal">s</mi> <mi mathvariant="normal">r</mi> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \mathrm {1\,lm=1\,cd\cdot 1\,sr} }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/67424c1324912ac7564eda7a8db930b1eb27ca75" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:16.162ex; height:2.176ex;" alt="{\displaystyle \mathrm {1\,lm=1\,cd\cdot 1\,sr} }"></span></dd></dl> <p>et </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \mathrm {1\,lx={\frac {1\,cd\cdot 1\,sr}{1\,m^{2}}}} }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> <mspace width="thinmathspace" /> <mi mathvariant="normal">l</mi> <mi mathvariant="normal">x</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mn>1</mn> <mspace width="thinmathspace" /> <mi mathvariant="normal">c</mi> <mi mathvariant="normal">d</mi> <mo>⋅</mo> <mn>1</mn> <mspace width="thinmathspace" /> <mi mathvariant="normal">s</mi> <mi mathvariant="normal">r</mi> </mrow> <mrow> <mn>1</mn> <mspace width="thinmathspace" /> <msup> <mi mathvariant="normal">m</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> </mrow> </mfrac> </mrow> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \mathrm {1\,lx={\frac {1\,cd\cdot 1\,sr}{1\,m^{2}}}} }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/44934d8edc41f3c68054ef2a15e52520321cd882" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.005ex; width:16.289ex; height:5.509ex;" alt="{\displaystyle \mathrm {1\,lx={\frac {1\,cd\cdot 1\,sr}{1\,m^{2}}}} }"></span></dd></dl> <p>Avec : </p> <ul><li>lm : <a href="/wiki/Lumen_(unit%C3%A9)" title="Lumen (unité)">lumen</a> qui est l'unité de <a href="/wiki/Flux_lumineux" title="Flux lumineux">flux lumineux</a> ;</li> <li>sr : stéradian qui est l'unité d'<a href="/wiki/Angle_solide" title="Angle solide">angle solide</a> ;</li> <li>cd : <a href="/wiki/Candela" title="Candela">candela</a> qui est l'unité d'<a href="/wiki/Intensit%C3%A9_lumineuse" title="Intensité lumineuse">intensité lumineuse</a> ;</li> <li>lx : <a href="/wiki/Lux_(unit%C3%A9)" title="Lux (unité)">lux</a> qui est l'unité d'<a href="/wiki/%C3%89clairement_lumineux" title="Éclairement lumineux">éclairement lumineux</a>.</li></ul> <div class="mw-heading mw-heading2"><h2 id="Notes_et_références"><span id="Notes_et_r.C3.A9f.C3.A9rences"></span>Notes et références</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=St%C3%A9radian&veaction=edit&section=6" title="Modifier la section : Notes et références" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=St%C3%A9radian&action=edit&section=6" title="Modifier le code source de la section : Notes et références"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="references-small decimal" style=""><div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-BIPM201926<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>,_<span_class="nowrap">tableau_4</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="note(s)"_>n.</abbr>&nbsp;(c)</span>-1"><span class="mw-cite-backlink noprint"><a href="#cite_ref-BIPM201926<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>,_<span_class="nowrap">tableau_4</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="note(s)"_>n.</abbr>&nbsp;(c)</span>_1-0">↑</a> </span><span class="reference-text"><a href="#BIPM2019">BIPM 2019</a>, <span class="nowrap"><abbr class="abbr" title="chapitre(s)">chap.</abbr> 2</span>, <span class="nowrap">section 3</span>, <span class="nowrap"><abbr class="abbr" title="paragraphe(s)">§</abbr> 2.3.4</span>, <span class="nowrap">tableau 4</span>, <span class="nowrap"><abbr class="abbr" title="note(s)">n.</abbr> (c)</span>, <abbr class="abbr" title="page(s)">p.</abbr> 26. </span> </li> <li id="cite_note-2"><span class="mw-cite-backlink noprint"><a href="#cite_ref-2">↑</a> </span><span class="reference-text"><a rel="nofollow" class="external text" href="https://www.legifrance.gouv.fr/eli/decret/2009/10/14/ECEI0912468D/jo/texte">Décret n° 2009-1234 du 14 octobre 2009 modifiant le décret n° 61-501 du 3 mai 1961 relatif aux unités de mesure et au contrôle des instruments de mesure</a> Site Legifrance</span> </li> <li id="cite_note-BIPM201925<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.3</span>-3"><span class="mw-cite-backlink noprint">↑ <sup><a href="#cite_ref-BIPM201925<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.3</span>_3-0">a</a> <a href="#cite_ref-BIPM201925<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.3</span>_3-1">b</a> et <a href="#cite_ref-BIPM201925<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.3</span>_3-2">c</a></sup> </span><span class="reference-text"><a href="#BIPM2019">BIPM 2019</a>, <span class="nowrap"><abbr class="abbr" title="chapitre(s)">chap.</abbr> 2</span>, <span class="nowrap">section 3</span>, <span class="nowrap"><abbr class="abbr" title="paragraphe(s)">§</abbr> 2.3.3</span>, <abbr class="abbr" title="page(s)">p.</abbr> 25. </span> </li> <li id="cite_note-BIPM201925<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>-4"><span class="mw-cite-backlink noprint"><a href="#cite_ref-BIPM201925<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>_4-0">↑</a> </span><span class="reference-text"><a href="#BIPM2019">BIPM 2019</a>, <span class="nowrap"><abbr class="abbr" title="chapitre(s)">chap.</abbr> 2</span>, <span class="nowrap">section 3</span>, <span class="nowrap"><abbr class="abbr" title="paragraphe(s)">§</abbr> 2.3.4</span>, <abbr class="abbr" title="page(s)">p.</abbr> 25. </span> </li> <li id="cite_note-BIPM201926<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>,_<span_class="nowrap">tableau_4</span>,_''<abbr_class="abbr_"_title="sub_verbo_(«_à_l'article_»)"_>s.v.</abbr>''_angle_solide-5"><span class="mw-cite-backlink noprint">↑ <sup><a href="#cite_ref-BIPM201926<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>,_<span_class="nowrap">tableau_4</span>,_''<abbr_class="abbr_"_title="sub_verbo_(«_à_l'article_»)"_>s.v.</abbr>''_angle_solide_5-0">a</a> et <a href="#cite_ref-BIPM201926<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>,_<span_class="nowrap">tableau_4</span>,_''<abbr_class="abbr_"_title="sub_verbo_(«_à_l'article_»)"_>s.v.</abbr>''_angle_solide_5-1">b</a></sup> </span><span class="reference-text"><a href="#BIPM2019">BIPM 2019</a>, <span class="nowrap"><abbr class="abbr" title="chapitre(s)">chap.</abbr> 2</span>, <span class="nowrap">section 3</span>, <span class="nowrap"><abbr class="abbr" title="paragraphe(s)">§</abbr> 2.3.4</span>, <span class="nowrap">tableau 4</span>, <i><abbr class="abbr" title="sub verbo (« à l'article »)">s.v.</abbr></i> angle solide, <abbr class="abbr" title="page(s)">p.</abbr> 26. </span> </li> <li id="cite_note-LNE201922<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;3</span>,_<span_class="nowrap">section_<abbr_class="abbr_"_title="2"_><span_class="romain"_style="text-transform:uppercase">II</span></abbr></span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2</span>-6"><span class="mw-cite-backlink noprint"><a href="#cite_ref-LNE201922<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;3</span>,_<span_class="nowrap">section_<abbr_class="abbr_"_title="2"_><span_class="romain"_style="text-transform:uppercase">II</span></abbr></span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2</span>_6-0">↑</a> </span><span class="reference-text"><a href="#LNE2019">LNE 2019</a>, <span class="nowrap"><abbr class="abbr" title="chapitre(s)">chap.</abbr> 3</span>, <span class="nowrap">section <abbr class="abbr" title="2"><span class="romain" style="text-transform:uppercase">II</span></abbr></span>, <span class="nowrap"><abbr class="abbr" title="paragraphe(s)">§</abbr> 2</span>, <abbr class="abbr" title="page(s)">p.</abbr> 22. </span> </li> <li id="cite_note-LNE201922<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;3</span>,_<span_class="nowrap">section_<abbr_class="abbr"_title="2"><span_class="romain"_style="text-transform:uppercase">II</span></abbr></span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2</span>,_<span_class="nowrap">tableau_2</span>,_''<abbr_class="abbr_"_title="sub_verbo_(«_à_l'article_»)"_>s.v.</abbr>''_angle_solide-7"><span class="mw-cite-backlink noprint"><a href="#cite_ref-LNE201922<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;3</span>,_<span_class="nowrap">section_<abbr_class="abbr"_title="2"><span_class="romain"_style="text-transform:uppercase">II</span></abbr></span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2</span>,_<span_class="nowrap">tableau_2</span>,_''<abbr_class="abbr_"_title="sub_verbo_(«_à_l'article_»)"_>s.v.</abbr>''_angle_solide_7-0">↑</a> </span><span class="reference-text"><a href="#LNE2019">LNE 2019</a>, <span class="nowrap"><abbr class="abbr" title="chapitre(s)">chap.</abbr> 3</span>, <span class="nowrap">section <abbr class="abbr" title="2"><span class="romain" style="text-transform:uppercase">II</span></abbr></span>, <span class="nowrap"><abbr class="abbr" title="paragraphe(s)">§</abbr> 2</span>, <span class="nowrap">tableau 2</span>, <i><abbr class="abbr" title="sub verbo (« à l'article »)">s.v.</abbr></i> angle solide, <abbr class="abbr" title="page(s)">p.</abbr> 22. </span> </li> <li id="cite_note-NoirotParisotBrouillet2019218annexes,_A.1,_''<abbr_class="abbr_"_title="sub_verbo_(«_à_l'article_»)"_>s.v.</abbr>''_équations_aux_dimensions-8"><span class="mw-cite-backlink noprint"><a href="#cite_ref-NoirotParisotBrouillet2019218annexes,_A.1,_''<abbr_class="abbr_"_title="sub_verbo_(«_à_l'article_»)"_>s.v.</abbr>''_équations_aux_dimensions_8-0">↑</a> </span><span class="reference-text"><a href="#NoirotParisotBrouillet2019">Noirot, Parisot et Brouillet 2019</a>, annexes, A.1, <i><abbr class="abbr" title="sub verbo (« à l'article »)">s.v.</abbr></i> équations aux dimensions, <abbr class="abbr" title="page(s)">p.</abbr> 218. </span> </li> <li id="cite_note-9"><span class="mw-cite-backlink noprint"><a href="#cite_ref-9">↑</a> </span><span class="reference-text"><span class="ouvrage" id="1995">« <a rel="nofollow" class="external text" href="http://www.bipm.org/fr/CGPM/db/20/8/"><cite style="font-style:normal;">Résolution 8 de la <abbr class="abbr" title="Vingtième">20<sup>e</sup></abbr> CGPM – Suppression de la classe des unités supplémentaires dans le SI</cite></a> », sur <span class="italique">bipm.org</span>, <a href="/wiki/Bureau_international_des_poids_et_mesures" title="Bureau international des poids et mesures">Bureau international des poids et mesures</a>, <time>1995</time></span>.</span> </li> <li id="cite_note-BIPM201927<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>,_<span_class="nowrap">tableau_4</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="note(s)"_>n.</abbr>&nbsp;(g)</span>-10"><span class="mw-cite-backlink noprint"><a href="#cite_ref-BIPM201927<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>,_<span_class="nowrap">tableau_4</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="note(s)"_>n.</abbr>&nbsp;(g)</span>_10-0">↑</a> </span><span class="reference-text"><a href="#BIPM2019">BIPM 2019</a>, <span class="nowrap"><abbr class="abbr" title="chapitre(s)">chap.</abbr> 2</span>, <span class="nowrap">section 3</span>, <span class="nowrap"><abbr class="abbr" title="paragraphe(s)">§</abbr> 2.3.4</span>, <span class="nowrap">tableau 4</span>, <span class="nowrap"><abbr class="abbr" title="note(s)">n.</abbr> (g)</span>, <abbr class="abbr" title="page(s)">p.</abbr> 27. </span> </li> <li id="cite_note-BIPM201928<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>,_<span_class="nowrap">tableau_6</span>,_''<abbr_class="abbr_"_title="sub_verbo_(«_à_l'article_»)"_>s.v.</abbr>''_intensité_énergétique-11"><span class="mw-cite-backlink noprint"><a href="#cite_ref-BIPM201928<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>,_<span_class="nowrap">tableau_6</span>,_''<abbr_class="abbr_"_title="sub_verbo_(«_à_l'article_»)"_>s.v.</abbr>''_intensité_énergétique_11-0">↑</a> </span><span class="reference-text"><a href="#BIPM2019">BIPM 2019</a>, <span class="nowrap"><abbr class="abbr" title="chapitre(s)">chap.</abbr> 2</span>, <span class="nowrap">section 3</span>, <span class="nowrap"><abbr class="abbr" title="paragraphe(s)">§</abbr> 2.3.4</span>, <span class="nowrap">tableau 6</span>, <i><abbr class="abbr" title="sub verbo (« à l'article »)">s.v.</abbr></i> intensité énergétique, <abbr class="abbr" title="page(s)">p.</abbr> 28. </span> </li> <li id="cite_note-BIPM201928<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>,_<span_class="nowrap">tableau_6</span>,_''<abbr_class="abbr_"_title="sub_verbo_(«_à_l'article_»)"_>s.v.</abbr>''_luminance_énergétique-12"><span class="mw-cite-backlink noprint"><a href="#cite_ref-BIPM201928<span_class="nowrap"><abbr_class="abbr_"_title="chapitre(s)"_>chap.</abbr>&nbsp;2</span>,_<span_class="nowrap">section_3</span>,_<span_class="nowrap"><abbr_class="abbr_"_title="paragraphe(s)"_>§</abbr>&nbsp;2.3.4</span>,_<span_class="nowrap">tableau_6</span>,_''<abbr_class="abbr_"_title="sub_verbo_(«_à_l'article_»)"_>s.v.</abbr>''_luminance_énergétique_12-0">↑</a> </span><span class="reference-text"><a href="#BIPM2019">BIPM 2019</a>, <span class="nowrap"><abbr class="abbr" title="chapitre(s)">chap.</abbr> 2</span>, <span class="nowrap">section 3</span>, <span class="nowrap"><abbr class="abbr" title="paragraphe(s)">§</abbr> 2.3.4</span>, <span class="nowrap">tableau 6</span>, <i><abbr class="abbr" title="sub verbo (« à l'article »)">s.v.</abbr></i> luminance énergétique, <abbr class="abbr" title="page(s)">p.</abbr> 28. </span> </li> <li id="cite_note-13"><span class="mw-cite-backlink noprint"><a href="#cite_ref-13">↑</a> </span><span class="reference-text"><a rel="nofollow" class="external text" href="http://www.new-learn.info/packages/tareb/docs/ecb/ecb_ch4_fr.pdf">Document sur l'éclairage des bâtiments</a>, LEARN, p. 9 ; voir l'article « <a href="/wiki/Champ_visuel" title="Champ visuel">Champ visuel</a> ».</span> </li> <li id="cite_note-14"><span class="mw-cite-backlink noprint"><a href="#cite_ref-14">↑</a> </span><span class="reference-text">La démonstration se fait en s'intéressant au cercle à l'intersection entre le cône et la sphère. Si le cône a un demi-angle au sommet <i>θ</i>, la circonférence de ce cercle est <span class="nowrap">2π <i>r</i> sin<i>θ</i></span>. Comme on s'intéresse à un cône tel que <span class="nowrap">2π(1 – cos<i>θ</i>) = 1</span> (stéradian), on peut calculer sin<i>θ</i> en utilisant la relation <span class="nowrap">sin<sup>2</sup><i>θ</i> + cos<sup>2</sup><i>θ</i> = 1</span>. La circonférence du disque dont on se sert pour développer le cône fait <span class="nowrap">2π <i>r</i></span> : on n'en prendra que la partie <span class="nowrap">2π <i>r</i> sin<i>θ</i></span> (comme dans un <a href="/wiki/Diagramme_circulaire" title="Diagramme circulaire">diagramme circulaire</a>).</span> </li> </ol></div> </div> <div class="mw-heading mw-heading2"><h2 id="Voir_aussi">Voir aussi</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=St%C3%A9radian&veaction=edit&section=7" title="Modifier la section : Voir aussi" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=St%C3%A9radian&action=edit&section=7" title="Modifier le code source de la section : Voir aussi"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r194021218">.mw-parser-output .autres-projets>.titre{text-align:center;margin:0.2em 0}.mw-parser-output .autres-projets>ul{margin:0;padding:0}.mw-parser-output .autres-projets>ul>li{list-style:none;margin:0.2em 0;text-indent:0;padding-left:24px;min-height:20px;text-align:left;display:block}.mw-parser-output .autres-projets>ul>li>a{font-style:italic}@media(max-width:720px){.mw-parser-output .autres-projets{float:none}}</style><div class="autres-projets boite-grise boite-a-droite noprint js-interprojets"> <p class="titre">Sur les autres projets Wikimedia :</p> <ul class="noarchive plainlinks"> <li class="commons"><a class="external text" href="https://commons.wikimedia.org/wiki/Category:Steradian?uselang=fr">Stéradian</a>, sur <span class="project">Wikimedia Commons</span></li><li class="wiktionary"><a href="https://fr.wiktionary.org/wiki/st%C3%A9radian" class="extiw" title="wikt:stéradian">stéradian</a>, <span class="nowrap">sur le <span class="project">Wiktionnaire</span></span></li><li class="wiktionary"><a href="https://fr.wiktionary.org/wiki/sr" class="extiw" title="wikt:sr">sr</a>, <span class="nowrap">sur le <span class="project">Wiktionnaire</span></span></li><li class="wikibooks"><a href="https://fr.wikibooks.org/wiki/Photographie/Math%C3%A9matiques/Notion_d%27angle_solide" class="extiw" title="b:Photographie/Mathématiques/Notion d'angle solide">Stéradian</a>, <span class="nowrap">sur <span class="project">Wikibooks</span></span></li> </ul> </div> <div class="mw-heading mw-heading3"><h3 id="Bibliographie">Bibliographie</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=St%C3%A9radian&veaction=edit&section=8" title="Modifier la section : Bibliographie" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=St%C3%A9radian&action=edit&section=8" title="Modifier le code source de la section : Bibliographie"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><span class="ouvrage" id="Bureau_international_des_poids_et_mesures2019"><small>[BIPM 2019]</small> <a href="/wiki/Bureau_international_des_poids_et_mesures" title="Bureau international des poids et mesures">Bureau international des poids et mesures</a> (<abbr class="abbr" title="préface">préf.</abbr> B. Inglis, J. Ullrich et M.J.T. Milton), <cite class="italique"><a href="/wiki/Brochure_sur_le_SI" title="Brochure sur le SI">Le Système international d'unités</a></cite>, Sèvres, BIPM, <time>2019</time>, <abbr class="abbr" title="neuvième">9<sup>e</sup></abbr> <abbr class="abbr" title="édition">éd.</abbr>, 109 <abbr class="abbr" title="pages">p.</abbr> <small style="line-height:1em;">(<a rel="nofollow" class="external text" href="https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-FR.pdf/bb7be5ff-4b2f-3834-f46a-5b4af3669870">lire en ligne</a> <abbr class="abbr indicateur-format format-pdf" title="Document au format Portable Document Format (PDF) d'Adobe">[PDF]</abbr>)</small><span class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Le+Syst%C3%A8me+international+d%27unit%C3%A9s&rft.place=S%C3%A8vres&rft.pub=BIPM&rft.edition=9&rft.aucorp=%5B%5BBureau+international+des+poids+et+mesures%5D%5D&rft.date=2019&rft.tpages=109&rfr_id=info%3Asid%2Ffr.wikipedia.org%3ASt%C3%A9radian"></span></span>.</li> <li><span class="ouvrage" id="Laboratoire_national_de_métrologie_et_d'essais2019"><small>[LNE 2019]</small> <a href="/wiki/Laboratoire_national_de_m%C3%A9trologie_et_d%27essais" title="Laboratoire national de métrologie et d'essais">Laboratoire national de métrologie et d'essais</a> (<abbr class="abbr" title="préface">préf.</abbr> Thomas Grenon), <cite class="italique">Le SI et la métrologie en France : des unités de mesure aux références</cite>, Les Ulis et Paris, <a href="/wiki/EDP_Sciences" title="EDP Sciences">EDP Sciences</a> et LNE, hors <abbr class="abbr" title="collection">coll.</abbr>, <time class="nowrap" datetime="2019-09" data-sort-value="2019-09">septembre 2019</time>, <abbr class="abbr" title="première">1<sup>re</sup></abbr> <abbr class="abbr" title="édition">éd.</abbr>, <abbr class="abbr" title="9"><span class="romain" style="text-transform:uppercase">IX</span></abbr>-156 <abbr class="abbr" title="pages">p.</abbr>, 16 × 24 <abbr class="abbr" title="centimètre">cm</abbr> <small style="line-height:1em;">(<a href="/wiki/International_Standard_Book_Number" title="International Standard Book Number">ISBN</a> <a href="/wiki/Sp%C3%A9cial:Ouvrages_de_r%C3%A9f%C3%A9rence/978-2-7598-2370-3" title="Spécial:Ouvrages de référence/978-2-7598-2370-3"><span class="nowrap">978-2-7598-2370-3</span></a>, <a href="/wiki/EAN_13" title="EAN 13">EAN</a> <a href="/wiki/Sp%C3%A9cial:Ouvrages_de_r%C3%A9f%C3%A9rence/9782759823703" title="Spécial:Ouvrages de référence/9782759823703"><span class="nowrap">9782759823703</span></a>, <a href="/wiki/Online_Computer_Library_Center" title="Online Computer Library Center">OCLC</a> <span class="plainlinks noarchive nowrap"><a rel="nofollow" class="external text" href="https://worldcat.org/fr/title/1127389558">1127389558</a></span>, <a href="/wiki/Biblioth%C3%A8que_nationale_de_France" title="Bibliothèque nationale de France">BNF</a> <span class="plainlinks noarchive nowrap"><a rel="nofollow" class="external text" href="https://catalogue.bnf.fr/ark:/12148/cb45788745v.public">45788745</a></span>, <a href="/wiki/Syst%C3%A8me_universitaire_de_documentation" title="Système universitaire de documentation">SUDOC</a> <span class="plainlinks noarchive nowrap"><a rel="nofollow" class="external text" href="https://www.sudoc.fr/238281043">238281043</a></span>, <a rel="nofollow" class="external text" href="https://laboutique.edpsciences.fr/produit/1092/9782759823697">présentation en ligne</a>, <a rel="nofollow" class="external text" href="//books.google.com/books?id=lg2wDwAAQBAJ">lire en ligne</a>)</small><span class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Le+SI+et+la+m%C3%A9trologie+en+France&rft.place=Les+Ulis+et+Paris&rft.pub=EDP+Sciences&rft.edition=1&rft.stitle=des+unit%C3%A9s+de+mesure+aux+r%C3%A9f%C3%A9rences&rft.au=Martin+Milton&rft.aucorp=%5B%5BLaboratoire+national+de+m%C3%A9trologie+et+d%27essais%5D%5D&rft.date=2019-09&rft.tpages=%3Cabbr+class%3D%22abbr+%22+title%3D%229%22+%3E%3Cspan+class%3D%22romain%22+style%3D%22text-transform%3Auppercase%22%3EIX%3C%2Fspan%3E%3C%2Fabbr%3E-156&rft.isbn=978-2-7598-2370-3&rft_id=info%3Aoclcnum%2F1127389558&rfr_id=info%3Asid%2Ffr.wikipedia.org%3ASt%C3%A9radian"></span></span>.</li> <li><span class="ouvrage" id="NoirotParisotBrouillet2019"><span class="ouvrage" id="Yves_NoirotJean-Paul_ParisotNathalie_Brouillet2019"><small>[Noirot, Parisot et Brouillet 2019]</small> Yves <span class="nom_auteur">Noirot</span>, Jean-Paul <span class="nom_auteur">Parisot</span> et Nathalie <span class="nom_auteur">Brouillet</span> (<abbr class="abbr" title="préface">préf.</abbr> <a href="/wiki/Michel_Combarnous" title="Michel Combarnous">Michel Combarnous</a>), <cite class="italique">Mathématiques pour la physique : cours de physique</cite>, Malakoff, <a href="/wiki/%C3%89ditions_Dunod" title="Éditions Dunod">Dunod</a>, <abbr class="abbr" title="collection">coll.</abbr> « Sciences Sup », <time class="nowrap" datetime="2019-11" data-sort-value="2019-11">novembre 2019</time> (<abbr class="abbr" title="première">1<sup>re</sup></abbr> <abbr class="abbr" title="édition">éd.</abbr> août 1997), <abbr class="abbr" title="10"><span class="romain" style="text-transform:uppercase">X</span></abbr>-229 <abbr class="abbr" title="pages">p.</abbr>, 17 × 24 <abbr class="abbr" title="centimètre">cm</abbr> <small style="line-height:1em;">(<a href="/wiki/International_Standard_Book_Number" title="International Standard Book Number">ISBN</a> <a href="/wiki/Sp%C3%A9cial:Ouvrages_de_r%C3%A9f%C3%A9rence/978-2-10-080288-3" title="Spécial:Ouvrages de référence/978-2-10-080288-3"><span class="nowrap">978-2-10-080288-3</span></a>, <a href="/wiki/EAN_13" title="EAN 13">EAN</a> <a href="/wiki/Sp%C3%A9cial:Ouvrages_de_r%C3%A9f%C3%A9rence/9782100802883" title="Spécial:Ouvrages de référence/9782100802883"><span class="nowrap">9782100802883</span></a>, <a href="/wiki/Online_Computer_Library_Center" title="Online Computer Library Center">OCLC</a> <span class="plainlinks noarchive nowrap"><a rel="nofollow" class="external text" href="https://worldcat.org/fr/title/492916073">492916073</a></span>, <a href="/wiki/Syst%C3%A8me_universitaire_de_documentation" title="Système universitaire de documentation">SUDOC</a> <span class="plainlinks noarchive nowrap"><a rel="nofollow" class="external text" href="https://www.sudoc.fr/241085152">241085152</a></span>, <a rel="nofollow" class="external text" href="https://www.dunod.com/sciences-techniques/mathematiques-pour-physique-0">présentation en ligne</a>, <a rel="nofollow" class="external text" href="//books.google.com/books?id=0BS_DwAAQBAJ">lire en ligne</a>)</small><span class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Math%C3%A9matiques+pour+la+physique&rft.place=Malakoff&rft.pub=Dunod&rft.stitle=cours+de+physique&rft.aulast=Noirot&rft.aufirst=Yves&rft.au=Parisot%2C+Jean-Paul&rft.au=Brouillet%2C+Nathalie&rft.date=2019-11&rft.tpages=%3Cabbr+class%3D%22abbr+%22+title%3D%2210%22+%3E%3Cspan+class%3D%22romain%22+style%3D%22text-transform%3Auppercase%22%3EX%3C%2Fspan%3E%3C%2Fabbr%3E-229&rft.isbn=978-2-10-080288-3&rft_id=info%3Aoclcnum%2F492916073&rfr_id=info%3Asid%2Ffr.wikipedia.org%3ASt%C3%A9radian"></span></span></span>.</li></ul> <div class="mw-heading mw-heading3"><h3 id="Articles_connexes">Articles connexes</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=St%C3%A9radian&veaction=edit&section=9" title="Modifier la section : Articles connexes" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=St%C3%A9radian&action=edit&section=9" title="Modifier le code source de la section : Articles connexes"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Angle_solide" title="Angle solide">Angle solide</a> | <a href="/wiki/Unit%C3%A9_d%27angle_solide" title="Unité d'angle solide">Unité d'angle solide</a></li> <li><a href="/wiki/Unit%C3%A9s_de_base_du_Syst%C3%A8me_international" title="Unités de base du Système international">Unités de base du Système international</a></li> <li><a href="/wiki/Unit%C3%A9s_d%C3%A9riv%C3%A9es_du_Syst%C3%A8me_international" class="mw-redirect" title="Unités dérivées du Système international">Unités dérivées du Système international</a></li></ul> <div class="mw-heading mw-heading3"><h3 id="Liens_externes">Liens externes</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=St%C3%A9radian&veaction=edit&section=10" title="Modifier la section : Liens externes" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=St%C3%A9radian&action=edit&section=10" title="Modifier le code source de la section : Liens externes"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><span class="ouvrage"><small>[OI]</small> <abbr class="abbr indicateur-langue" title="Langue : anglais">(en)</abbr> « <a rel="nofollow" class="external text" href="https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100531594"><cite style="font-style:normal;" lang="en">steradian</cite></a> » [« stéradian »], notice d'authorité <abbr class="abbr" title="numéro">n<sup>o</sup></abbr> 20110803100531594 de l'<i>Oxford Index</i>, sur <span class="italique">Oxford Reference</span>, <a href="/wiki/Oxford_University_Press" title="Oxford University Press">Oxford University Press</a></span>.</li></ul> <div class="navbox-container" style="clear:both;"> <table class="navbox collapsible noprint autocollapse" style=""> <tbody><tr><th class="navbox-title" colspan="3" style=""><div style="float:left; width:6em; text-align:left"><div class="noprint plainlinks nowrap tnavbar" style="padding:0; font-size:xx-small; color:var(--color-emphasized, #000000);"><a href="/wiki/Mod%C3%A8le:Palette_Syst%C3%A8me_international" title="Modèle:Palette Système international"><abbr class="abbr" title="Voir ce modèle.">v</abbr></a> · <a class="external text" href="https://fr.wikipedia.org/w/index.php?title=Mod%C3%A8le:Palette_Syst%C3%A8me_international&action=edit"><abbr class="abbr" title="Modifier ce modèle. Merci de prévisualiser avant de sauvegarder.">m</abbr></a></div></div><div style="font-size:110%"><a href="/wiki/Syst%C3%A8me_international_d%27unit%C3%A9s" title="Système international d'unités">Système international d'unités</a></div></th> </tr> <tr> <th class="navbox-group" style=""><a href="/wiki/Unit%C3%A9s_de_base_du_Syst%C3%A8me_international" title="Unités de base du Système international">Unités de base</a></th> <td class="navbox-list" style=""><div class="liste-horizontale"> <ul><li><a href="/wiki/Amp%C3%A8re" title="Ampère">ampère</a></li> <li><a href="/wiki/Candela" title="Candela">candela</a></li> <li><a href="/wiki/Kelvin" title="Kelvin">kelvin</a></li> <li><a href="/wiki/Kilogramme" title="Kilogramme">kilogramme</a></li> <li><a href="/wiki/M%C3%A8tre" title="Mètre">mètre</a></li> <li><a href="/wiki/Mole_(unit%C3%A9)" title="Mole (unité)">mole</a></li> <li><a href="/wiki/Seconde_(temps)" title="Seconde (temps)">seconde</a></li></ul> </div></td> <td class="navbox-image" rowspan="6" style="vertical-align:middle;padding-left:7px"><span typeof="mw:File"><a href="/wiki/Fichier:SI_base_units.svg" class="mw-file-description" title="Unités de base du Système international"><img alt="Unités de base du Système international" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/38/SI_base_units.svg/110px-SI_base_units.svg.png" decoding="async" width="110" height="110" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/38/SI_base_units.svg/165px-SI_base_units.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/38/SI_base_units.svg/220px-SI_base_units.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></td> </tr> <tr> <th class="navbox-group" style=""><a href="/wiki/Unit%C3%A9_d%C3%A9riv%C3%A9e_du_Syst%C3%A8me_international" title="Unité dérivée du Système international">Unités dérivées</a></th> <td class="navbox-list navbox-even" style=""><div class="liste-horizontale"> <ul><li><a href="/wiki/Becquerel" title="Becquerel">becquerel</a></li> <li><a href="/wiki/Coulomb" title="Coulomb">coulomb</a></li> <li><a href="/wiki/Degr%C3%A9_Celsius" title="Degré Celsius">degré Celsius</a></li> <li><a href="/wiki/Farad" title="Farad">farad</a></li> <li><a href="/wiki/Gray_(unit%C3%A9)" title="Gray (unité)">gray</a></li> <li><a href="/wiki/Henry_(unit%C3%A9)" title="Henry (unité)">henry</a></li> <li><a href="/wiki/Hertz" title="Hertz">hertz</a></li> <li><a href="/wiki/Joule" title="Joule">joule</a></li> <li><a href="/wiki/Katal" title="Katal">katal</a></li> <li><a href="/wiki/Lumen_(unit%C3%A9)" title="Lumen (unité)">lumen</a></li> <li><a href="/wiki/Lux_(unit%C3%A9)" title="Lux (unité)">lux</a></li> <li><a href="/wiki/Newton_(unit%C3%A9)" title="Newton (unité)">newton</a></li> <li><a href="/wiki/Ohm_(unit%C3%A9)" title="Ohm (unité)">ohm</a></li> <li><a href="/wiki/Pascal_(unit%C3%A9)" title="Pascal (unité)">pascal</a></li> <li><a href="/wiki/Radian" title="Radian">radian</a></li> <li><a href="/wiki/Siemens_(unit%C3%A9)" title="Siemens (unité)">siemens</a></li> <li><a href="/wiki/Sievert" title="Sievert">sievert</a></li> <li><a class="mw-selflink selflink">stéradian</a></li> <li><a href="/wiki/Tesla_(unit%C3%A9)" title="Tesla (unité)">tesla</a></li> <li><a href="/wiki/Volt" title="Volt">volt</a></li> <li><a href="/wiki/Watt" title="Watt">watt</a></li> <li><a href="/wiki/Weber_(unit%C3%A9)" title="Weber (unité)">weber</a></li></ul> </div></td> </tr> <tr> <th class="navbox-group" style=""><a href="/wiki/Pr%C3%A9fixes_du_Syst%C3%A8me_international_d%27unit%C3%A9s" title="Préfixes du Système international d'unités">Préfixes</a></th> <td class="navbox-list" style=""><div class="liste-horizontale"> <ul><li><a href="/wiki/Quecto" class="mw-redirect" title="Quecto">quecto</a></li> <li><a href="/wiki/Ronto" class="mw-redirect" title="Ronto">ronto</a></li> <li><a href="/wiki/Yocto" class="mw-redirect" title="Yocto">yocto</a></li> <li><a href="/wiki/Zepto" class="mw-redirect" title="Zepto">zepto</a></li> <li><a href="/wiki/Atto" class="mw-redirect" title="Atto">atto</a></li> <li><a href="/wiki/Femto" title="Femto">femto</a></li> <li><a href="/wiki/Pico_(pr%C3%A9fixe)" title="Pico (préfixe)">pico</a></li> <li><a href="/wiki/Nano" title="Nano">nano</a></li> <li><a href="/wiki/Micro_(pr%C3%A9fixe_du_Syst%C3%A8me_international_d%27unit%C3%A9s)" title="Micro (préfixe du Système international d'unités)">micro</a></li> <li><a href="/wiki/Milli" title="Milli">milli</a></li> <li><a href="/wiki/Centi" title="Centi">centi</a></li> <li><a href="/wiki/D%C3%A9ci" title="Déci">déci</a></li> <li><a href="/wiki/D%C3%A9ca_(pr%C3%A9fixe_du_Syst%C3%A8me_international_d%27unit%C3%A9s)" title="Déca (préfixe du Système international d'unités)">déca</a></li> <li><a href="/wiki/Hecto" title="Hecto">hecto</a></li> <li><a href="/wiki/Kilo" title="Kilo">kilo</a></li> <li><a href="/wiki/M%C3%A9ga" title="Méga">méga</a></li> <li><a href="/wiki/Giga" title="Giga">giga</a></li> <li><a href="/wiki/T%C3%A9ra" title="Téra">téra</a></li> <li><a href="/wiki/P%C3%A9ta" title="Péta">péta</a></li> <li><a href="/wiki/Exa" class="mw-redirect" title="Exa">exa</a></li> <li><a href="/wiki/Zetta" class="mw-redirect" title="Zetta">zetta</a></li> <li><a href="/wiki/Yotta" class="mw-redirect" title="Yotta">yotta</a></li> <li><a href="/wiki/Ronna" class="mw-redirect" title="Ronna">ronna</a></li> <li><a href="/wiki/Quetta_(pr%C3%A9fixe_du_Syst%C3%A8me_international_d%27unit%C3%A9s)" class="mw-redirect" title="Quetta (préfixe du Système international d'unités)">quetta</a></li></ul> </div></td> </tr> <tr> <th class="navbox-group" style=""><a href="/wiki/Pr%C3%A9fixes_du_Syst%C3%A8me_international_d%27unit%C3%A9s" title="Préfixes du Système international d'unités">Préfixes désuets</a></th> <td class="navbox-list navbox-even" style=""><div class="liste-horizontale"> <ul><li><a href="/wiki/D%C3%A9cimilli" title="Décimilli">décimilli</a></li> <li><a href="/wiki/Myria" title="Myria">myria</a></li></ul> </div></td> </tr> <tr> <th class="navbox-group" style="">SI</th> <td class="navbox-list" style=""><div class="liste-horizontale"> <ul><li><a href="/wiki/Brochure_sur_le_SI" title="Brochure sur le SI">Brochure sur le SI</a></li> <li><a href="/wiki/Red%C3%A9finition_du_Syst%C3%A8me_international_d%27unit%C3%A9s_de_2018-2019" title="Redéfinition du Système international d'unités de 2018-2019">Redéfinition du Système international d'unités de 2018-2019</a></li></ul> </div></td> </tr> <tr> <th class="navbox-group" style=""><a href="/wiki/Bureau_international_des_poids_et_mesures" title="Bureau international des poids et mesures">BIPM</a></th> <td class="navbox-list navbox-even" style=""><div class="liste-horizontale"> <ul><li><a href="/wiki/Comit%C3%A9_international_des_poids_et_mesures" title="Comité international des poids et mesures">CIPM</a> <ul><li><a href="/wiki/Comit%C3%A9_consultatif_des_unit%C3%A9s" title="Comité consultatif des unités">CCU</a></li></ul></li> <li><a href="/wiki/Conf%C3%A9rence_g%C3%A9n%C3%A9rale_des_poids_et_mesures" title="Conférence générale des poids et mesures">CGPM</a></li> <li><a href="/wiki/Convention_du_M%C3%A8tre" title="Convention du Mètre">Convention du Mètre</a> <ul><li><a href="/wiki/%C3%89tats_membres_de_la_Convention_du_M%C3%A8tre" title="États membres de la Convention du Mètre">États membres</a></li></ul></li> <li><a href="/wiki/Journ%C3%A9e_mondiale_de_la_m%C3%A9trologie" title="Journée mondiale de la métrologie">Journée mondiale de la métrologie</a></li> <li><a href="/wiki/EURAMET" title="EURAMET">EURAMET</a></li></ul> </div></td> </tr> </tbody></table> </div> <ul id="bandeau-portail" class="bandeau-portail"><li><span class="bandeau-portail-element"><span class="bandeau-portail-icone"><span class="noviewer" typeof="mw:File"><a href="/wiki/Portail:Physique" title="Portail de la physique"><img 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