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class="vector-menu-heading"> Navegació </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-mainpage-description" class="mw-list-item"><a href="/wiki/Portada" title="Visiteu la pàgina principal [z]" accesskey="z"><span>Portada</span></a></li><li id="n-randompage" class="mw-list-item"><a href="/wiki/Especial:Article_aleatori" title="Carrega una pàgina a l’atzar [x]" accesskey="x"><span>Article a l'atzar</span></a></li><li id="n-Articles-de-qualitat" class="mw-list-item"><a href="/wiki/Viquip%C3%A8dia:Articles_de_qualitat"><span>Articles de qualitat</span></a></li> </ul> </div> </div> <div id="p-Comunitat" class="vector-menu mw-portlet mw-portlet-Comunitat" > <div class="vector-menu-heading"> Comunitat </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-portal" class="mw-list-item"><a href="/wiki/Viquip%C3%A8dia:Portal" title="Sobre el projecte, què podeu fer, on trobareu les coses"><span>Portal viquipedista</span></a></li><li id="n-Agenda-d'actes" class="mw-list-item"><a href="/wiki/Viquip%C3%A8dia:Trobades"><span>Agenda d'actes</span></a></li><li id="n-recentchanges" class="mw-list-item"><a href="/wiki/Especial:Canvis_recents" title="Una llista dels canvis recents al wiki [r]" accesskey="r"><span>Canvis recents</span></a></li><li id="n-La-taverna" class="mw-list-item"><a href="/wiki/Viquip%C3%A8dia:La_taverna"><span>La taverna</span></a></li><li id="n-contactpage" class="mw-list-item"><a href="/wiki/Viquip%C3%A8dia:Contacte"><span>Contacte</span></a></li><li id="n-Xat" class="mw-list-item"><a href="/wiki/Viquip%C3%A8dia:Canals_IRC"><span>Xat</span></a></li><li id="n-help" class="mw-list-item"><a href="/wiki/Viquip%C3%A8dia:Ajuda" title="El lloc per a saber més coses"><span>Ajuda</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> <a href="/wiki/Portada" class="mw-logo"> <img class="mw-logo-icon" src="/static/images/icons/wikipedia.png" alt="" aria-hidden="true" height="50" width="50"> <span class="mw-logo-container skin-invert"> <img class="mw-logo-wordmark" alt="Viquipèdia" src="/static/images/mobile/copyright/wikipedia-wordmark-ca.svg" style="width: 7.5em; height: 1.4375em;"> <img class="mw-logo-tagline" alt="l'Enciclopèdia Lliure" src="/static/images/mobile/copyright/wikipedia-tagline-ca.svg" width="120" height="14" style="width: 7.5em; height: 0.875em;"> </span> </a> </div> <div class="vector-header-end"> <div id="p-search" role="search" class="vector-search-box-vue vector-search-box-collapses vector-search-box-show-thumbnail vector-search-box-auto-expand-width vector-search-box"> <a href="/wiki/Especial:Cerca" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only search-toggle" title="Cerca a la Viquipèdia [f]" accesskey="f"><span class="vector-icon mw-ui-icon-search mw-ui-icon-wikimedia-search"></span> <span>Cerca</span> </a> <div 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<div id="p-vector-user-menu-preferences" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-userpage" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <nav class="vector-appearance-landmark" aria-label="Aparença"> <div id="vector-appearance-dropdown" class="vector-dropdown " title="Change the appearance of the page's font size, width, and color" > <input type="checkbox" id="vector-appearance-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-appearance-dropdown" class="vector-dropdown-checkbox " aria-label="Aparença" > <label id="vector-appearance-dropdown-label" for="vector-appearance-dropdown-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-appearance mw-ui-icon-wikimedia-appearance"></span> <span class="vector-dropdown-label-text">Aparença</span> </label> <div class="vector-dropdown-content"> <div id="vector-appearance-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <div id="p-vector-user-menu-notifications" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-overflow" class="vector-menu mw-portlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="//donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_ca.wikipedia.org&uselang=ca" class=""><span>Donatius</span></a> </li> <li id="pt-createaccount-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Especial:Crea_compte&returnto=Llum+di%C3%BCrna" title="Us animem a crear un compte i iniciar una sessió, encara que no és obligatori" class=""><span>Crea un compte</span></a> </li> <li id="pt-login-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Especial:Registre_i_entrada&returnto=Llum+di%C3%BCrna" title="Us animem a registrar-vos, però no és obligatori [o]" accesskey="o" class=""><span>Inicia la sessió</span></a> </li> </ul> </div> </div> </div> <div id="vector-user-links-dropdown" class="vector-dropdown vector-user-menu vector-button-flush-right vector-user-menu-logged-out" title="Més opcions" > <input type="checkbox" id="vector-user-links-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-user-links-dropdown" class="vector-dropdown-checkbox " aria-label="Eines personals" > <label id="vector-user-links-dropdown-label" for="vector-user-links-dropdown-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-ellipsis mw-ui-icon-wikimedia-ellipsis"></span> <span class="vector-dropdown-label-text">Eines personals</span> </label> <div class="vector-dropdown-content"> <div id="p-personal" class="vector-menu mw-portlet mw-portlet-personal user-links-collapsible-item" title="Menú d'usuari" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport" class="user-links-collapsible-item mw-list-item"><a href="//donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_ca.wikipedia.org&uselang=ca"><span>Donatius</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Especial:Crea_compte&returnto=Llum+di%C3%BCrna" title="Us animem a crear un compte i iniciar una sessió, encara que no és obligatori"><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Crea un compte</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Especial:Registre_i_entrada&returnto=Llum+di%C3%BCrna" title="Us animem a registrar-vos, però no és obligatori [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Inicia la sessió</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> Pàgines per a editors no registrats <a href="/wiki/Ajuda:Introducci%C3%B3" aria-label="Vegeu més informació sobre l'edició"><span>més informació</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/Especial:Contribucions_pr%C3%B2pies" title="Una llista de les modificacions fetes des d'aquesta adreça IP [y]" accesskey="y"><span>Contribucions</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/Especial:Discussi%C3%B3_personal" title="Discussió sobre les edicions per aquesta adreça ip. [n]" accesskey="n"><span>Discussió per aquest IP</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Lloc"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Contingut" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Contingut</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">mou a la barra lateral</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">amaga</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Inici</div> </a> </li> <li id="toc-Intensitat_de_la_llum_diürna_en_diferents_condicions" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Intensitat_de_la_llum_diürna_en_diferents_condicions"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Intensitat de la llum diürna en diferents condicions</span> </div> </a> <ul id="toc-Intensitat_de_la_llum_diürna_en_diferents_condicions-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Referències" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Referències"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Referències</span> </div> </a> <ul id="toc-Referències-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Vegeu_també" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Vegeu_també"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Vegeu també</span> </div> </a> <ul id="toc-Vegeu_també-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Enllaços_externs" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Enllaços_externs"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Enllaços externs</span> </div> </a> <ul id="toc-Enllaços_externs-sublist" class="vector-toc-list"> </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="Contingut" 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="Commuta la taula de continguts." > <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">Commuta la taula de continguts.</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">Llum diürna</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="Vés a un article en una altra llengua. Disponible en 41 llengües" > <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-41" 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">41 llengües</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/Daglig" title="Daglig - afrikaans" lang="af" hreflang="af" data-title="Daglig" data-language-autonym="Afrikaans" data-language-local-name="afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ang mw-list-item"><a href="https://ang.wikipedia.org/wiki/L%C4%93oht_(d%C3%A6g)" title="Lēoht (dæg) - anglès antic" lang="ang" hreflang="ang" data-title="Lēoht (dæg)" data-language-autonym="Ænglisc" data-language-local-name="anglès antic" class="interlanguage-link-target"><span>Ænglisc</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%86%D9%87%D8%A7%D8%B1" title="نهار - àrab" lang="ar" hreflang="ar" data-title="نهار" data-language-autonym="العربية" data-language-local-name="àrab" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ary mw-list-item"><a href="https://ary.wikipedia.org/wiki/%D8%B6%D9%88_%D8%A7%D9%84%D9%86%D9%87%D8%A7%D8%B1" title="ضو النهار - Moroccan Arabic" lang="ary" hreflang="ary" data-title="ضو النهار" data-language-autonym="الدارجة" data-language-local-name="Moroccan Arabic" class="interlanguage-link-target"><span>الدارجة</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%A6%E0%A6%BF%E0%A6%AC%E0%A6%BE%E0%A6%B2%E0%A7%8B%E0%A6%95" title="দিবালোক - bengalí" lang="bn" hreflang="bn" data-title="দিবালোক" data-language-autonym="বাংলা" data-language-local-name="bengalí" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Dagslys" title="Dagslys - danès" lang="da" hreflang="da" data-title="Dagslys" data-language-autonym="Dansk" data-language-local-name="danès" 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/Tageslicht" title="Tageslicht - alemany" lang="de" hreflang="de" data-title="Tageslicht" data-language-autonym="Deutsch" data-language-local-name="alemany" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Daylight" title="Daylight - anglès" lang="en" hreflang="en" data-title="Daylight" data-language-autonym="English" data-language-local-name="anglès" 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/Taglumo" title="Taglumo - esperanto" lang="eo" hreflang="eo" data-title="Taglumo" data-language-autonym="Esperanto" data-language-local-name="esperanto" 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/Luz_diurna" title="Luz diurna - espanyol" lang="es" hreflang="es" data-title="Luz diurna" data-language-autonym="Español" data-language-local-name="espanyol" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%86%D9%88%D8%B1_%D8%B1%D9%88%D8%B2" title="نور روز - persa" lang="fa" hreflang="fa" data-title="نور روز" data-language-autonym="فارسی" data-language-local-name="persa" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Lumi%C3%A8re_du_jour" title="Lumière du jour - francès" lang="fr" hreflang="fr" data-title="Lumière du jour" data-language-autonym="Français" data-language-local-name="francès" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-fy mw-list-item"><a href="https://fy.wikipedia.org/wiki/Deiljocht" title="Deiljocht - frisó occidental" lang="fy" hreflang="fy" data-title="Deiljocht" data-language-autonym="Frysk" data-language-local-name="frisó occidental" class="interlanguage-link-target"><span>Frysk</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%99%D7%95%D7%9D" title="יום - hebreu" lang="he" hreflang="he" data-title="יום" data-language-autonym="עברית" data-language-local-name="hebreu" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%91%D5%A5%D6%80%D5%A5%D5%AF%D5%A1%D5%B5%D5%AB%D5%B6_%D5%AC%D5%B8%D6%82%D5%B5%D5%BD" title="Ցերեկային լույս - armeni" lang="hy" hreflang="hy" data-title="Ցերեկային լույս" data-language-autonym="Հայերեն" data-language-local-name="armeni" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Cahaya_siang" title="Cahaya siang - indonesi" lang="id" hreflang="id" data-title="Cahaya siang" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesi" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-inh mw-list-item"><a href="https://inh.wikipedia.org/wiki/%D0%94%D0%B8_(%D1%85%D0%B0%D0%BD_%D0%B4%D0%B0%D0%BA%D1%8A%D0%B0)" title="Ди (хан дакъа) - ingúix" lang="inh" hreflang="inh" data-title="Ди (хан дакъа)" data-language-autonym="ГӀалгӀай" data-language-local-name="ingúix" class="interlanguage-link-target"><span>ГӀалгӀай</span></a></li><li class="interlanguage-link interwiki-kaa mw-list-item"><a href="https://kaa.wikipedia.org/wiki/K%C3%BAn" title="Kún - karakalpak" lang="kaa" hreflang="kaa" data-title="Kún" data-language-autonym="Qaraqalpaqsha" data-language-local-name="karakalpak" class="interlanguage-link-target"><span>Qaraqalpaqsha</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%9A%D2%AF%D0%BD%D0%B4%D1%96%D0%B7" title="Күндіз - kazakh" lang="kk" hreflang="kk" data-title="Күндіз" data-language-autonym="Қазақша" data-language-local-name="kazakh" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-kn mw-list-item"><a href="https://kn.wikipedia.org/wiki/%E0%B2%B9%E0%B2%97%E0%B2%B2%E0%B3%81" title="ಹಗಲು - kannada" lang="kn" hreflang="kn" data-title="ಹಗಲು" data-language-autonym="ಕನ್ನಡ" data-language-local-name="kannada" class="interlanguage-link-target"><span>ಕನ್ನಡ</span></a></li><li class="interlanguage-link interwiki-krc mw-list-item"><a href="https://krc.wikipedia.org/wiki/%D0%9A%D1%8E%D0%BD_(%D0%B7%D0%B0%D0%BC%D0%B0%D0%BD_%D0%B1%D0%B8%D1%80%D0%B8%D0%BC)" title="Кюн (заман бирим) - karatxai-balkar" lang="krc" hreflang="krc" data-title="Кюн (заман бирим)" data-language-autonym="Къарачай-малкъар" data-language-local-name="karatxai-balkar" class="interlanguage-link-target"><span>Къарачай-малкъар</span></a></li><li class="interlanguage-link interwiki-mhr mw-list-item"><a href="https://mhr.wikipedia.org/wiki/%D0%9A%D0%B5%D1%87%D0%B5_(%D0%B6%D0%B0%D0%BF)" title="Кече (жап) - Eastern Mari" lang="mhr" hreflang="mhr" data-title="Кече (жап)" data-language-autonym="Олык марий" data-language-local-name="Eastern Mari" class="interlanguage-link-target"><span>Олык марий</span></a></li><li class="interlanguage-link interwiki-mn mw-list-item"><a href="https://mn.wikipedia.org/wiki/%D3%A8%D0%B4%D3%A9%D1%80" title="Өдөр - mongol" lang="mn" hreflang="mn" data-title="Өдөр" data-language-autonym="Монгол" data-language-local-name="mongol" class="interlanguage-link-target"><span>Монгол</span></a></li><li class="interlanguage-link interwiki-myv mw-list-item"><a href="https://myv.wikipedia.org/wiki/%D0%A7%D0%B8_(%D1%88%D0%BA%D0%B0%D0%BD%D1%8C_%D0%B2%D0%B0%D0%BB)" title="Чи (шкань вал) - mordovià erza" lang="myv" hreflang="myv" data-title="Чи (шкань вал)" data-language-autonym="Эрзянь" data-language-local-name="mordovià erza" class="interlanguage-link-target"><span>Эрзянь</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Daglicht" title="Daglicht - neerlandès" lang="nl" hreflang="nl" data-title="Daglicht" data-language-autonym="Nederlands" data-language-local-name="neerlandès" 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/Dagslys" title="Dagslys - noruec nynorsk" lang="nn" hreflang="nn" data-title="Dagslys" data-language-autonym="Norsk nynorsk" data-language-local-name="noruec 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/Dagslys" title="Dagslys - noruec bokmål" lang="nb" hreflang="nb" data-title="Dagslys" data-language-autonym="Norsk bokmål" data-language-local-name="noruec bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-or mw-list-item"><a href="https://or.wikipedia.org/wiki/%E0%AC%A6%E0%AC%BF%E0%AC%A8" title="ଦିନ - oriya" lang="or" hreflang="or" data-title="ଦିନ" data-language-autonym="ଓଡ଼ିଆ" data-language-local-name="oriya" class="interlanguage-link-target"><span>ଓଡ଼ିଆ</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Dzie%C5%84" title="Dzień - polonès" lang="pl" hreflang="pl" data-title="Dzień" data-language-autonym="Polski" data-language-local-name="polonès" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Luz_do_dia" title="Luz do dia - portuguès" lang="pt" hreflang="pt" data-title="Luz do dia" data-language-autonym="Português" data-language-local-name="portuguès" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%94%D0%BD%D0%B5%D0%B2%D0%BD%D0%BE%D0%B9_%D1%81%D0%B2%D0%B5%D1%82" title="Дневной свет - rus" lang="ru" hreflang="ru" data-title="Дневной свет" data-language-autonym="Русский" data-language-local-name="rus" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Dagsljus" title="Dagsljus - suec" lang="sv" hreflang="sv" data-title="Dagsljus" data-language-autonym="Svenska" data-language-local-name="suec" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-szl mw-list-item"><a href="https://szl.wikipedia.org/wiki/D%C5%BAy%C5%84" title="Dźyń - silesià" lang="szl" hreflang="szl" data-title="Dźyń" data-language-autonym="Ślůnski" data-language-local-name="silesià" class="interlanguage-link-target"><span>Ślůnski</span></a></li><li class="interlanguage-link interwiki-tcy mw-list-item"><a href="https://tcy.wikipedia.org/wiki/%E0%B2%AA%E0%B2%97%E0%B3%86%E0%B2%B2%E0%B3%8D" title="ಪಗೆಲ್ - Tulu" lang="tcy" hreflang="tcy" data-title="ಪಗೆಲ್" data-language-autonym="ತುಳು" data-language-local-name="Tulu" class="interlanguage-link-target"><span>ತುಳು</span></a></li><li class="interlanguage-link interwiki-tt mw-list-item"><a href="https://tt.wikipedia.org/wiki/%D0%9A%D3%A9%D0%BD" title="Көн - tàtar" lang="tt" hreflang="tt" data-title="Көн" data-language-autonym="Татарча / tatarça" data-language-local-name="tàtar" class="interlanguage-link-target"><span>Татарча / tatarça</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%94%D0%B5%D0%BD%D0%BD%D0%B5_%D1%81%D0%B2%D1%96%D1%82%D0%BB%D0%BE" title="Денне світло - ucraïnès" lang="uk" hreflang="uk" data-title="Денне світло" data-language-autonym="Українська" data-language-local-name="ucraïnès" 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%AF%D9%86_%DA%A9%DB%8C_%D8%B1%D9%88%D8%B4%D9%86%DB%8C" title="دن کی روشنی - urdú" lang="ur" hreflang="ur" data-title="دن کی روشنی" data-language-autonym="اردو" data-language-local-name="urdú" 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/Kun" title="Kun - uzbek" lang="uz" hreflang="uz" data-title="Kun" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="uzbek" 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/%C3%81nh_s%C3%A1ng_ban_ng%C3%A0y" title="Ánh sáng ban ngày - vietnamita" lang="vi" hreflang="vi" data-title="Ánh sáng ban ngày" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamita" 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data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Aparença</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">mou a la barra lateral</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">amaga</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">De la Viquipèdia, l'enciclopèdia lliure</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="ca" dir="ltr"><figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fitxer:Daylight.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/99/Daylight.png/220px-Daylight.png" decoding="async" width="220" height="126" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/99/Daylight.png/330px-Daylight.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/99/Daylight.png/440px-Daylight.png 2x" data-file-width="982" data-file-height="562" /></a><figcaption>Mapa del món que mostra les zones de la Terra que reben la llum del dia al voltant de les 13:00 GMT, 2 d'abril.</figcaption></figure> <p>La <b>llum diürna</b> o la <b>llum del dia</b> és la combinació de tota la <a href="/wiki/Llum" title="Llum">llum</a> directa i indirecta a l'aire lliure el <a href="/wiki/Dia" title="Dia">dia</a>. Això inclou la <a href="/wiki/Llum" title="Llum">llum</a> directa, la <a href="/wiki/Radiaci%C3%B3_difusa" title="Radiació difusa">radiació difusa</a> del cel, i (sovint), les dues es reflecteixen des de la <a href="/wiki/Terra" title="Terra">Terra</a> i els objectes terrestres. La llum del sol dispersada o reflectida dels objectes a l'espai exterior (és a dir, més enllà de l'<a href="/wiki/Atmosfera_de_la_Terra" class="mw-redirect" title="Atmosfera de la Terra">atmosfera de la Terra</a>) generalment no es considera com a llum diürna. Per tant, la <a href="/wiki/Lluna" title="Lluna">lluna</a> no es considera llum del dia, tot i ser "la llum del sol indirecta". La part diürna del dia és el període de cada dia quan es produeix la llum del dia. La llum diürna succeeix perquè la Terra gira i en un i altre costat el sol brilla produint aquesta llum. </p><p>La llum diürna està present en un lloc determinat, fins a cert punt, sempre que el <a href="/wiki/Sol" title="Sol">sol</a> està per sobre de l'horitzó en aquesta ubicació. (Això és cert per poc més del 50% de la <a href="/wiki/Terra" title="Terra">Terra</a> en un moment donat. No obstant això, la <a href="/wiki/Il%C2%B7luminaci%C3%B3" title="Il·luminació">il·luminació</a> exterior pot variar de 120.000 <a href="/wiki/Lux" title="Lux">lux</a> per a la llum directa del sol a <a href="/wiki/Migdia" title="Migdia">migdia</a>, el que pot causar irritació i <a href="/wiki/Dolor" title="Dolor">dolor</a> als ulls, a menys de 5 <a href="/wiki/Lux" title="Lux">lux</a> per a una tempesta amb núvols densos amb el sol a l'horitzó (fins i tot <1 lux per al cas més extrem), que pot fer visibles les ombres de llunyanes llums de carrer. Pot ser més fosc en circumstàncies inusuals, com ara un <a href="/wiki/Eclipsi_solar" class="mw-redirect" title="Eclipsi solar">eclipsi solar</a> o nivells molt alts de fum atmosfèric (vegeu el <a href="/wiki/Dia_fosc_de_Nova_Anglaterra" title="Dia fosc de Nova Anglaterra">Dia fosc de Nova Anglaterra</a>), la pols<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> o <a href="/wiki/Cendra_volc%C3%A0nica" title="Cendra volcànica">cendra volcànica</a>.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Intensitat_de_la_llum_diürna_en_diferents_condicions"><span id="Intensitat_de_la_llum_di.C3.BCrna_en_diferents_condicions"></span>Intensitat de la llum diürna en diferents condicions</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Llum_di%C3%BCrna&action=edit&section=1" title="Modifica la secció: Intensitat de la llum diürna en diferents condicions"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="wikitable"> <tbody><tr> <th>Il·luminació</th> <th>Exemple </th></tr> <tr> <td>120.000 lux</td> <td>La llum solar més brillant </td></tr> <tr> <td>110.000 lux</td> <td>La llum del sol brillant </td></tr> <tr> <td>20.000 lux</td> <td>Pantalla il·luminada en un dia clar, a migdia </td></tr> <tr> <td>10.000 - 25.000 lux</td> <td>Dia ennuvolat típic, al migdia </td></tr> <tr> <td><200 lux</td> <td>Extrem de tempestes amb núvols foscos i densos, al migdia </td></tr> <tr> <td>400 lux</td> <td><a href="/wiki/Ortus" title="Ortus">Ortus</a> o <a href="/wiki/Oc%C3%A0s" title="Ocàs">ocàs</a> en un dia clar (il·luminació ambient). </td></tr> <tr> <td>40 lux</td> <td>Totalment cobert, capvespre/alba </td></tr> <tr> <td><1 lux</td> <td>Extrem de tempestes amb núvols foscos i densos, capvespre/alba </td></tr></tbody></table> <p>Per comparació, els nivells d'il·luminació durant la nit són: </p> <table class="wikitable"> <tbody><tr> <th>Il·luminació</th> <th>Exemple </th></tr> <tr> <td><1 lux</td> <td><a href="/wiki/Clar_de_lluna" class="mw-redirect" title="Clar de lluna">Clar de lluna</a><sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <td>0,25 lux</td> <td>Lluna plena en una nit clara<sup id="cite_ref-radfaq_4-0" class="reference"><a href="#cite_note-radfaq-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <td>0,01 lux</td> <td>Quart creixent </td></tr> <tr> <td>0,002 lux</td> <td>Cel clar en una nit sense lluna, llum de les estrelles com la luminescència atmosfèrica<sup id="cite_ref-radfaq_4-1" class="reference"><a href="#cite_note-radfaq-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <td>0,0002 lux</td> <td>Llum de les estrelles en un cel clar en una nit sense lluna, sense incloure la luminescència atmosfèrica<sup id="cite_ref-radfaq_4-2" class="reference"><a href="#cite_note-radfaq-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <td>0,00014 lux</td> <td>Brillantor de Venus<sup id="cite_ref-radfaq_4-3" class="reference"><a href="#cite_note-radfaq-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <td>0,0001 lux</td> <td>Llum de les estrelles en un cel ennuvolat en una nit sense lluna<sup id="cite_ref-radfaq_4-4" class="reference"><a href="#cite_note-radfaq-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </td></tr></tbody></table> <div class="mw-heading mw-heading2"><h2 id="Referències"><span id="Refer.C3.A8ncies"></span>Referències</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Llum_di%C3%BCrna&action=edit&section=2" title="Modifica la secció: Referències"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="reflist {{#if: | references-column-count references-column-count-{{{col}}}" style="list-style-type: decimal;"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text"><sup title="Cal donar format a aquesta referència." class="noprint"><span class="noprint" style="color:blue;"><i>[<a href="/wiki/VP:REF" class="mw-redirect" title="VP:REF">enllaç sense format</a>]</i></span></sup> <a rel="nofollow" class="external free" href="http://www.perryton.com/black.htm">http://www.perryton.com/black.htm</a></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><a href="#cite_ref-2">↑</a></span> <span class="reference-text"><sup title="Cal donar format a aquesta referència." class="noprint"><span class="noprint" style="color:blue;"><i>[<a href="/wiki/VP:REF" class="mw-redirect" title="VP:REF">enllaç sense format</a>]</i></span></sup> <a rel="nofollow" class="external free" href="https://volcanoes.usgs.gov/ash/">http://volcanoes.usgs.gov/ash/</a></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><a href="#cite_ref-3">↑</a></span> <span class="reference-text"><span class="citation" style="font-style:normal" id="CITEREFBunning1969"><span style="font-variant: small-caps;">Bunning</span>, Erwin; and Moser, Ilse «Interference of moonlight with the photoperiodic measurement of time by plants, and their adaptive reaction». <i>Proceedings of the National Academy of Sciences of the United States of America</i>, 62, 4, abril 1969, pàg. 1018–1022. <a href="/wiki/PubMed" title="PubMed">PMID</a>: <a href="https://www.ncbi.nlm.nih.gov/pubmed/16591742?dopt=Abstract" class="extiw" title="pmid:16591742">16591742</a>.</span></span> </li> <li id="cite_note-radfaq-4"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-radfaq_4-0">4,0</a></sup> <sup><a href="#cite_ref-radfaq_4-1">4,1</a></sup> <sup><a href="#cite_ref-radfaq_4-2">4,2</a></sup> <sup><a href="#cite_ref-radfaq_4-3">4,3</a></sup> <sup><a href="#cite_ref-radfaq_4-4">4,4</a></sup></span> <span class="reference-text">Paul Schlyter, <a rel="nofollow" class="external text" href="http://stjarnhimlen.se/comp/radfaq.html#10">Radiometry and photometry in astronomy FAQ</a> (2006)</span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><a href="#cite_ref-5">↑</a></span> <span class="reference-text"><span class="citation" style="font-style:normal">«<a rel="nofollow" class="external text" href="https://web.archive.org/web/20080620123040/http://en.petzl.com/petzl/frontoffice/Lampes/static/referentiel/present_referentiel_en.jsp">Petzl reference system for lighting performance</a>». Arxivat de l'<a rel="nofollow" class="external text" href="http://en.petzl.com/petzl/frontoffice/Lampes/static/referentiel/present_referentiel_en.jsp">original</a> el 2008-06-20.</span></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="Vegeu_també"><span id="Vegeu_tamb.C3.A9"></span>Vegeu també</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Llum_di%C3%BCrna&action=edit&section=3" title="Modifica la secció: Vegeu també"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Horari_d%27estiu" title="Horari d'estiu">Horari d'estiu</a></li> <li><a href="/wiki/Crepuscle" title="Crepuscle">Crepuscle</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Enllaços_externs"><span id="Enlla.C3.A7os_externs"></span>Enllaços externs</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Llum_di%C3%BCrna&action=edit&section=4" title="Modifica la secció: Enllaços externs"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r33663753">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:#f9f9f9;display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 0;text-align:center}@media(min-width:500px){.mw-parser-output .side-box-flex{display:flex;align-items:center}.mw-parser-output .side-box-text{flex:1;min-width:0}}@media(min-width:720px){.mw-parser-output .side-box{width:238px}.mw-parser-output .side-box-right{clear:right;float:right;margin-left:1em}.mw-parser-output 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class="extiw" title="commons:Category:Sunlight">Llum diürna</a></b></i></div></div> </div> <ul><li><a rel="nofollow" class="external text" href="http://www.rics.org/Property/Propertymanagement/Easements/Rightstolightdetermination">Royal Institution of Chartered Surveyors - Rights to Light Determination Homepage</a></li> <li><a rel="nofollow" class="external text" href="http://daylightchart.sourceforge.net/">Daylight Chart</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20160204044229/http://daylightchart.sourceforge.net/">Arxivat</a> 2016-02-04 a <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a>. shows sunrise and sunset times in a chart, for any location in the world.</li> <li><a rel="nofollow" class="external free" href="http://www.gandraxa.com/length_of_day.xml">http://www.gandraxa.com/length_of_day.xml</a> Deriving the formulas to calculate the length of day.</li></ul> <div role="navigation" class="navbox" aria-label="Navbox" 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