CINXE.COM
Solar luminosity: Difference between revisions - Wikipedia
<!DOCTYPE html> <html class="client-nojs vector-feature-language-in-header-enabled vector-feature-language-in-main-page-header-disabled vector-feature-sticky-header-disabled vector-feature-page-tools-pinned-disabled vector-feature-toc-pinned-clientpref-1 vector-feature-main-menu-pinned-disabled vector-feature-limited-width-clientpref-1 vector-feature-limited-width-content-disabled vector-feature-custom-font-size-clientpref-1 vector-feature-appearance-pinned-clientpref-1 vector-feature-night-mode-enabled skin-theme-clientpref-day vector-toc-available" lang="en" dir="ltr"> <head> <meta charset="UTF-8"> <title>Solar luminosity: Difference between revisions - Wikipedia</title> <script>(function(){var className="client-js vector-feature-language-in-header-enabled vector-feature-language-in-main-page-header-disabled vector-feature-sticky-header-disabled vector-feature-page-tools-pinned-disabled vector-feature-toc-pinned-clientpref-1 vector-feature-main-menu-pinned-disabled vector-feature-limited-width-clientpref-1 vector-feature-limited-width-content-disabled vector-feature-custom-font-size-clientpref-1 vector-feature-appearance-pinned-clientpref-1 vector-feature-night-mode-enabled skin-theme-clientpref-day vector-toc-available";var cookie=document.cookie.match(/(?:^|; )enwikimwclientpreferences=([^;]+)/);if(cookie){cookie[1].split('%2C').forEach(function(pref){className=className.replace(new RegExp('(^| )'+pref.replace(/-clientpref-\w+$|[^\w-]+/g,'')+'-clientpref-\\w+( |$)'),'$1'+pref+'$2');});}document.documentElement.className=className;}());RLCONF={"wgBreakFrames":false,"wgSeparatorTransformTable":["",""],"wgDigitTransformTable":["",""],"wgDefaultDateFormat":"dmy" ,"wgMonthNames":["","January","February","March","April","May","June","July","August","September","October","November","December"],"wgRequestId":"c0d5d6cb-9a44-4e38-9f9e-3f7505e3291d","wgCanonicalNamespace":"","wgCanonicalSpecialPageName":false,"wgNamespaceNumber":0,"wgPageName":"Solar_luminosity","wgTitle":"Solar luminosity","wgCurRevisionId":1208963967,"wgRevisionId":935901824,"wgArticleId":210900,"wgIsArticle":true,"wgIsRedirect":false,"wgAction":"view","wgUserName":null,"wgUserGroups":["*"],"wgCategories":["CS1 errors: chapter ignored","Sun","Stellar astronomy","Units of power","Units of measurement in astronomy"],"wgPageViewLanguage":"en","wgPageContentLanguage":"en","wgPageContentModel":"wikitext","wgRelevantPageName":"Solar_luminosity","wgRelevantArticleId":210900,"wgIsProbablyEditable":true,"wgRelevantPageIsProbablyEditable":true,"wgRestrictionEdit":[],"wgRestrictionMove":[],"wgNoticeProject":"wikipedia","wgCiteReferencePreviewsActive":false,"wgFlaggedRevsParams":{"tags":{ "status":{"levels":1}}},"wgMediaViewerOnClick":true,"wgMediaViewerEnabledByDefault":true,"wgPopupsFlags":0,"wgVisualEditor":{"pageLanguageCode":"en","pageLanguageDir":"ltr","pageVariantFallbacks":"en"},"wgMFDisplayWikibaseDescriptions":{"search":true,"watchlist":true,"tagline":false,"nearby":true},"wgWMESchemaEditAttemptStepOversample":false,"wgWMEPageLength":6000,"extRevisionSliderTimeOffset":0,"wgDiffOldId":935901736,"wgDiffNewId":935901824,"wgRelatedArticlesCompat":[],"wgEditSubmitButtonLabelPublish":true,"wgULSPosition":"interlanguage","wgULSisCompactLinksEnabled":false,"wgVector2022LanguageInHeader":true,"wgULSisLanguageSelectorEmpty":false,"wgWikibaseItemId":"Q843877","wgCheckUserClientHintsHeadersJsApi":["brands","architecture","bitness","fullVersionList","mobile","model","platform","platformVersion"],"GEHomepageSuggestedEditsEnableTopics":true,"wgGETopicsMatchModeEnabled":false,"wgGEStructuredTaskRejectionReasonTextInputEnabled":false,"wgGELevelingUpEnabledForUser":false}; RLSTATE={"ext.globalCssJs.user.styles":"ready","site.styles":"ready","user.styles":"ready","ext.globalCssJs.user":"ready","user":"ready","user.options":"loading","ext.visualEditor.diffPage.init.styles":"ready","oojs-ui.styles.icons-accessibility":"ready","oojs-ui.styles.icons-editing-advanced":"ready","oojs-ui-core.styles":"ready","oojs-ui.styles.indicators":"ready","mediawiki.widgets.styles":"ready","oojs-ui-core.icons":"ready","ext.RevisionSlider.lazyCss":"ready","mediawiki.interface.helpers.styles":"ready","mediawiki.diff.styles":"ready","ext.cite.styles":"ready","ext.math.styles":"ready","mediawiki.helplink":"ready","skins.vector.search.codex.styles":"ready","skins.vector.styles":"ready","skins.vector.icons":"ready","ext.wikimediamessages.styles":"ready","ext.visualEditor.desktopArticleTarget.noscript":"ready","ext.uls.interlanguage":"ready","wikibase.client.init":"ready","ext.wikimediaBadges":"ready"};RLPAGEMODULES=["ext.visualEditor.diffPage.init","ext.RevisionSlider.lazyJs", "mediawiki.diff","ext.cite.ux-enhancements","mediawiki.page.media","site","mediawiki.page.ready","mediawiki.toc","skins.vector.js","ext.centralNotice.geoIP","ext.gadget.ReferenceTooltips","ext.gadget.switcher","ext.urlShortener.toolbar","ext.centralauth.centralautologin","mmv.bootstrap","ext.popups","ext.visualEditor.desktopArticleTarget.init","ext.visualEditor.targetLoader","ext.echo.centralauth","ext.eventLogging","ext.wikimediaEvents","ext.navigationTiming","ext.uls.interface","ext.cx.eventlogging.campaigns","ext.cx.uls.quick.actions","wikibase.client.vector-2022","ext.checkUser.clientHints","ext.growthExperiments.SuggestedEditSession","wikibase.sidebar.tracking"];</script> <script>(RLQ=window.RLQ||[]).push(function(){mw.loader.impl(function(){return["user.options@12s5i",function($,jQuery,require,module){mw.user.tokens.set({"patrolToken":"+\\","watchToken":"+\\","csrfToken":"+\\"}); }];});});</script> <link rel="stylesheet" href="/w/load.php?lang=en&modules=ext.RevisionSlider.lazyCss%7Cext.cite.styles%7Cext.math.styles%7Cext.uls.interlanguage%7Cext.visualEditor.desktopArticleTarget.noscript%7Cext.visualEditor.diffPage.init.styles%7Cext.wikimediaBadges%7Cext.wikimediamessages.styles%7Cmediawiki.diff.styles%7Cmediawiki.helplink%7Cmediawiki.interface.helpers.styles%7Cmediawiki.widgets.styles%7Coojs-ui-core.icons%2Cstyles%7Coojs-ui.styles.icons-accessibility%2Cicons-editing-advanced%2Cindicators%7Cskins.vector.icons%2Cstyles%7Cskins.vector.search.codex.styles%7Cwikibase.client.init&only=styles&skin=vector-2022"> <script async="" src="/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022"></script> <meta name="ResourceLoaderDynamicStyles" content=""> <link rel="stylesheet" href="/w/load.php?lang=en&modules=site.styles&only=styles&skin=vector-2022"> <meta name="generator" content="MediaWiki 1.44.0-wmf.5"> <meta name="referrer" content="origin"> <meta name="referrer" content="origin-when-cross-origin"> <meta name="robots" content="noindex,nofollow,max-image-preview:standard"> <meta name="format-detection" content="telephone=no"> <meta property="og:image" content="https://upload.wikimedia.org/wikipedia/commons/thumb/6/6c/Solar_evolution_%28English%29.svg/1200px-Solar_evolution_%28English%29.svg.png"> <meta property="og:image:width" content="1200"> <meta property="og:image:height" content="856"> <meta property="og:image" content="https://upload.wikimedia.org/wikipedia/commons/thumb/6/6c/Solar_evolution_%28English%29.svg/800px-Solar_evolution_%28English%29.svg.png"> <meta property="og:image:width" content="800"> <meta property="og:image:height" content="571"> <meta property="og:image" content="https://upload.wikimedia.org/wikipedia/commons/thumb/6/6c/Solar_evolution_%28English%29.svg/640px-Solar_evolution_%28English%29.svg.png"> <meta property="og:image:width" content="640"> <meta property="og:image:height" content="456"> <meta name="viewport" content="width=1120"> <meta property="og:title" content="Solar luminosity: Difference between revisions - Wikipedia"> <meta property="og:type" content="website"> <link rel="preconnect" href="//upload.wikimedia.org"> <link rel="alternate" media="only screen and (max-width: 640px)" href="//en.m.wikipedia.org/wiki/Solar_luminosity"> <link rel="alternate" type="application/x-wiki" title="Edit this page" href="/w/index.php?title=Solar_luminosity&action=edit"> <link rel="apple-touch-icon" href="/static/apple-touch/wikipedia.png"> <link rel="icon" href="/static/favicon/wikipedia.ico"> <link rel="search" type="application/opensearchdescription+xml" href="/w/rest.php/v1/search" title="Wikipedia (en)"> <link rel="EditURI" type="application/rsd+xml" href="//en.wikipedia.org/w/api.php?action=rsd"> <link rel="canonical" href="https://en.wikipedia.org/wiki/Solar_luminosity"> <link rel="license" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en"> <link rel="alternate" type="application/atom+xml" title="Wikipedia Atom feed" href="/w/index.php?title=Special:RecentChanges&feed=atom"> <link rel="dns-prefetch" href="//login.wikimedia.org"> </head> <body class="mw-article-diff skin--responsive skin-vector skin-vector-search-vue mediawiki ltr sitedir-ltr mw-hide-empty-elt ns-0 ns-subject mw-editable page-Solar_luminosity rootpage-Solar_luminosity skin-vector-2022 action-view"><a class="mw-jump-link" href="#bodyContent">Jump to content</a> <div class="vector-header-container"> <header class="vector-header mw-header"> <div class="vector-header-start"> <nav class="vector-main-menu-landmark" aria-label="Site"> <div id="vector-main-menu-dropdown" class="vector-dropdown vector-main-menu-dropdown vector-button-flush-left vector-button-flush-right" > <input type="checkbox" id="vector-main-menu-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-main-menu-dropdown" class="vector-dropdown-checkbox " aria-label="Main menu" > <label id="vector-main-menu-dropdown-label" for="vector-main-menu-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-menu mw-ui-icon-wikimedia-menu"></span> <span class="vector-dropdown-label-text">Main menu</span> </label> <div class="vector-dropdown-content"> <div id="vector-main-menu-unpinned-container" class="vector-unpinned-container"> <div id="vector-main-menu" class="vector-main-menu vector-pinnable-element"> <div class="vector-pinnable-header vector-main-menu-pinnable-header vector-pinnable-header-unpinned" data-feature-name="main-menu-pinned" data-pinnable-element-id="vector-main-menu" data-pinned-container-id="vector-main-menu-pinned-container" data-unpinned-container-id="vector-main-menu-unpinned-container" > <div class="vector-pinnable-header-label">Main menu</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-main-menu.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-main-menu.unpin">hide</button> </div> <div id="p-navigation" class="vector-menu mw-portlet mw-portlet-navigation" > <div class="vector-menu-heading"> Navigation </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-mainpage-description" class="mw-list-item"><a href="/wiki/Main_Page" title="Visit the main page [z]" accesskey="z"><span>Main page</span></a></li><li id="n-contents" class="mw-list-item"><a href="/wiki/Wikipedia:Contents" title="Guides to browsing Wikipedia"><span>Contents</span></a></li><li id="n-currentevents" class="mw-list-item"><a href="/wiki/Portal:Current_events" title="Articles related to current events"><span>Current events</span></a></li><li id="n-randompage" class="mw-list-item"><a href="/wiki/Special:Random" title="Visit a randomly selected article [x]" accesskey="x"><span>Random article</span></a></li><li id="n-aboutsite" class="mw-list-item"><a href="/wiki/Wikipedia:About" title="Learn about Wikipedia and how it works"><span>About Wikipedia</span></a></li><li id="n-contactpage" class="mw-list-item"><a href="//en.wikipedia.org/wiki/Wikipedia:Contact_us" title="How to contact Wikipedia"><span>Contact us</span></a></li> </ul> </div> </div> <div id="p-interaction" class="vector-menu mw-portlet mw-portlet-interaction" > <div class="vector-menu-heading"> Contribute </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-help" class="mw-list-item"><a href="/wiki/Help:Contents" title="Guidance on how to use and edit Wikipedia"><span>Help</span></a></li><li id="n-introduction" class="mw-list-item"><a href="/wiki/Help:Introduction" title="Learn how to edit Wikipedia"><span>Learn to edit</span></a></li><li id="n-portal" class="mw-list-item"><a href="/wiki/Wikipedia:Community_portal" title="The hub for editors"><span>Community portal</span></a></li><li id="n-recentchanges" class="mw-list-item"><a href="/wiki/Special:RecentChanges" title="A list of recent changes to Wikipedia [r]" accesskey="r"><span>Recent changes</span></a></li><li id="n-upload" class="mw-list-item"><a href="/wiki/Wikipedia:File_upload_wizard" title="Add images or other media for use on Wikipedia"><span>Upload file</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> <a href="/wiki/Main_Page" 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="Wikipedia" src="/static/images/mobile/copyright/wikipedia-wordmark-en.svg" style="width: 7.5em; height: 1.125em;"> <img class="mw-logo-tagline" alt="The Free Encyclopedia" src="/static/images/mobile/copyright/wikipedia-tagline-en.svg" width="117" height="13" style="width: 7.3125em; height: 0.8125em;"> </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/Special:Search" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only search-toggle" title="Search Wikipedia [f]" accesskey="f"><span class="vector-icon mw-ui-icon-search mw-ui-icon-wikimedia-search"></span> <span>Search</span> </a> <div class="vector-typeahead-search-container"> <div class="cdx-typeahead-search cdx-typeahead-search--show-thumbnail cdx-typeahead-search--auto-expand-width"> <form action="/w/index.php" id="searchform" class="cdx-search-input cdx-search-input--has-end-button"> <div id="simpleSearch" class="cdx-search-input__input-wrapper" data-search-loc="header-moved"> <div class="cdx-text-input cdx-text-input--has-start-icon"> <input class="cdx-text-input__input" type="search" name="search" placeholder="Search Wikipedia" aria-label="Search Wikipedia" autocapitalize="sentences" title="Search Wikipedia [f]" accesskey="f" id="searchInput" > <span class="cdx-text-input__icon cdx-text-input__start-icon"></span> </div> <input type="hidden" name="title" value="Special:Search"> </div> <button class="cdx-button cdx-search-input__end-button">Search</button> </form> </div> </div> </div> <nav class="vector-user-links vector-user-links-wide" aria-label="Personal tools"> <div class="vector-user-links-main"> <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="Appearance"> <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="Appearance" > <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">Appearance</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="https://donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_en.wikipedia.org&uselang=en" class=""><span>Donate</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=Special:CreateAccount&returnto=Solar+luminosity&returntoquery=diff%3Dprev%26oldid%3D935901824" title="You are encouraged to create an account and log in; however, it is not mandatory" class=""><span>Create account</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=Special:UserLogin&returnto=Solar+luminosity&returntoquery=diff%3Dprev%26oldid%3D935901824" title="You're encouraged to log in; however, it's not mandatory. [o]" accesskey="o" class=""><span>Log in</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="Log in and more options" > <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="Personal tools" > <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">Personal tools</span> </label> <div class="vector-dropdown-content"> <div id="p-personal" class="vector-menu mw-portlet mw-portlet-personal user-links-collapsible-item" title="User menu" > <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="https://donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_en.wikipedia.org&uselang=en"><span>Donate</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Special:CreateAccount&returnto=Solar+luminosity&returntoquery=diff%3Dprev%26oldid%3D935901824" title="You are encouraged to create an account and log in; however, it is not mandatory"><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Create account</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Special:UserLogin&returnto=Solar+luminosity&returntoquery=diff%3Dprev%26oldid%3D935901824" title="You're encouraged to log in; however, it's not mandatory. [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Log in</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"> Pages for logged out editors <a href="/wiki/Help:Introduction" aria-label="Learn more about editing"><span>learn more</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/Special:MyContributions" title="A list of edits made from this IP address [y]" accesskey="y"><span>Contributions</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/Special:MyTalk" title="Discussion about edits from this IP address [n]" accesskey="n"><span>Talk</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"><!-- CentralNotice --></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="Site"> <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="Contents" 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">Contents</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">hide</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">(Top)</div> </a> </li> <li id="toc-Determination" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Determination"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Determination</span> </div> </a> <ul id="toc-Determination-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Further_reading" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Further_reading"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Further reading</span> </div> </a> <ul id="toc-Further_reading-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>External links</span> </div> </a> <ul id="toc-External_links-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="Contents" 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="Toggle the table of contents" > <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">Toggle the table of contents</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">Solar luminosity: Difference between revisions</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="Go to an article in another language. Available in 43 languages" > <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-43" 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">43 languages</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/Sonligsterkte" title="Sonligsterkte – Afrikaans" lang="af" hreflang="af" data-title="Sonligsterkte" 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%A5%D8%B6%D8%A7%D8%A1%D8%A9_%D8%B4%D9%85%D8%B3%D9%8A%D8%A9" title="إضاءة شمسية – Arabic" lang="ar" hreflang="ar" data-title="إضاءة شمسية" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%B8%E0%A7%8C%E0%A6%B0_%E0%A6%9C%E0%A7%8D%E0%A6%AF%E0%A7%8B%E0%A6%A4%E0%A6%BF" title="সৌর জ্যোতি – Bangla" lang="bn" hreflang="bn" data-title="সৌর জ্যোতি" data-language-autonym="বাংলা" data-language-local-name="Bangla" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-be-x-old mw-list-item"><a href="https://be-tarask.wikipedia.org/wiki/%D0%A1%D0%BE%D0%BD%D0%B5%D1%87%D0%BD%D0%B0%D1%8F_%D1%81%D1%8C%D0%B2%D1%8F%D1%86%D1%96%D0%BB%D1%8C%D0%BD%D0%B0%D1%81%D1%8C%D1%86%D1%8C" title="Сонечная сьвяцільнасьць – Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Сонечная сьвяцільнасьць" 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%D0%BB%D1%8A%D0%BD%D1%87%D0%B5%D0%B2%D0%B0_%D1%81%D0%B2%D0%B5%D1%82%D0%B8%D0%BC%D0%BE%D1%81%D1%82" title="Слънчева светимост – Bulgarian" lang="bg" hreflang="bg" data-title="Слънчева светимост" data-language-autonym="Български" data-language-local-name="Bulgarian" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Lluminositat_solar" title="Lluminositat solar – Catalan" lang="ca" hreflang="ca" data-title="Lluminositat solar" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cv mw-list-item"><a href="https://cv.wikipedia.org/wiki/%D0%A5%C4%95%D0%B2%D0%B5%D0%BB_%C3%A7%D1%83%D1%82%D0%B0%D1%82%D0%B0%D1%81%D0%BB%C4%83%D1%85%C4%95" title="Хĕвел çутатаслăхĕ – Chuvash" lang="cv" hreflang="cv" data-title="Хĕвел çутатаслăхĕ" data-language-autonym="Чӑвашла" data-language-local-name="Chuvash" class="interlanguage-link-target"><span>Чӑвашла</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Slune%C4%8Dn%C3%AD_z%C3%A1%C5%99ivost" title="Sluneční zářivost – Czech" lang="cs" hreflang="cs" data-title="Sluneční zářivost" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Sonnenleuchtkraft" title="Sonnenleuchtkraft – German" lang="de" hreflang="de" data-title="Sonnenleuchtkraft" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Luminosidad_solar" title="Luminosidad solar – Spanish" lang="es" hreflang="es" data-title="Luminosidad solar" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Suna_lumeco" title="Suna lumeco – Esperanto" lang="eo" hreflang="eo" data-title="Suna lumeco" data-language-autonym="Esperanto" data-language-local-name="Esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Eguzki-argitasun" title="Eguzki-argitasun – Basque" lang="eu" hreflang="eu" data-title="Eguzki-argitasun" 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%AA%D8%A7%D8%A8%D9%86%D8%AF%DA%AF%DB%8C_%D8%AE%D9%88%D8%B1%D8%B4%DB%8C%D8%AF" title="تابندگی خورشید – Persian" lang="fa" hreflang="fa" data-title="تابندگی خورشید" data-language-autonym="فارسی" data-language-local-name="Persian" 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/Luminosit%C3%A9_solaire" title="Luminosité solaire – French" lang="fr" hreflang="fr" data-title="Luminosité solaire" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%ED%83%9C%EC%96%91_%EA%B4%91%EB%8F%84" title="태양 광도 – Korean" lang="ko" hreflang="ko" data-title="태양 광도" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%B1%D6%80%D6%87%D5%AB_%D5%BA%D5%A1%D5%B5%D5%AE%D5%A1%D5%BC%D5%B8%D6%82%D5%A9%D5%B5%D5%B8%D6%82%D5%B6" title="Արևի պայծառություն – Armenian" lang="hy" hreflang="hy" data-title="Արևի պայծառություն" data-language-autonym="Հայերեն" data-language-local-name="Armenian" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%B8%E0%A5%8C%E0%A4%B0_%E0%A4%9C%E0%A5%8D%E0%A4%AF%E0%A5%8B%E0%A4%A4%E0%A4%BF" title="सौर ज्योति – Hindi" lang="hi" hreflang="hi" data-title="सौर ज्योति" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Luminositas_Matahari" title="Luminositas Matahari – Indonesian" lang="id" hreflang="id" data-title="Luminositas Matahari" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" 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/Luminosit%C3%A0_solare" title="Luminosità solare – Italian" lang="it" hreflang="it" data-title="Luminosità solare" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%9B%E1%83%96%E1%83%98%E1%83%A1_%E1%83%A1%E1%83%98%E1%83%99%E1%83%90%E1%83%A8%E1%83%99%E1%83%90%E1%83%A8%E1%83%94" title="მზის სიკაშკაშე – Georgian" lang="ka" hreflang="ka" data-title="მზის სიკაშკაშე" data-language-autonym="ქართული" data-language-local-name="Georgian" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Mng%27aro_wa_Jua" title="Mng'aro wa Jua – Swahili" lang="sw" hreflang="sw" data-title="Mng'aro wa Jua" data-language-autonym="Kiswahili" data-language-local-name="Swahili" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Saul%C4%97s_%C5%A1viesis" title="Saulės šviesis – Lithuanian" lang="lt" hreflang="lt" data-title="Saulės šviesis" data-language-autonym="Lietuvių" data-language-local-name="Lithuanian" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%A1%D0%BE%D0%BD%D1%87%D0%B5%D0%B2%D0%B0_%D1%81%D1%98%D0%B0%D1%98%D0%BD%D0%BE%D1%81%D1%82" title="Сончева сјајност – Macedonian" lang="mk" hreflang="mk" data-title="Сончева сјајност" data-language-autonym="Македонски" data-language-local-name="Macedonian" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-mr mw-list-item"><a href="https://mr.wikipedia.org/wiki/%E0%A4%B8%E0%A5%8C%E0%A4%B0_%E0%A4%A4%E0%A5%87%E0%A4%9C%E0%A4%B8%E0%A5%8D%E0%A4%B5%E0%A4%BF%E0%A4%A4%E0%A4%BE" title="सौर तेजस्विता – Marathi" lang="mr" hreflang="mr" data-title="सौर तेजस्विता" data-language-autonym="मराठी" data-language-local-name="Marathi" class="interlanguage-link-target"><span>मराठी</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Kekilauan_suria" title="Kekilauan suria – Malay" lang="ms" hreflang="ms" data-title="Kekilauan suria" data-language-autonym="Bahasa Melayu" data-language-local-name="Malay" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-my mw-list-item"><a href="https://my.wikipedia.org/wiki/%E1%80%94%E1%80%B1%E1%80%9B%E1%80%B1%E1%80%AC%E1%80%84%E1%80%BA%E1%80%81%E1%80%BC%E1%80%8A%E1%80%BA%E1%80%90%E1%80%B1%E1%80%AC%E1%80%80%E1%80%BA%E1%80%95%E1%80%99%E1%80%BE%E1%80%AF" title="နေရောင်ခြည်တောက်ပမှု – Burmese" lang="my" hreflang="my" data-title="နေရောင်ခြည်တောက်ပမှု" data-language-autonym="မြန်မာဘာသာ" data-language-local-name="Burmese" class="interlanguage-link-target"><span>မြန်မာဘာသာ</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E5%A4%AA%E9%99%BD%E5%85%89%E5%BA%A6" title="太陽光度 – Japanese" lang="ja" hreflang="ja" data-title="太陽光度" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Solluminositet" title="Solluminositet – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Solluminositet" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Jasno%C5%9B%C4%87_S%C5%82o%C5%84ca" title="Jasność Słońca – Polish" lang="pl" hreflang="pl" data-title="Jasność Słońca" data-language-autonym="Polski" data-language-local-name="Polish" 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/Luminosidade_solar" title="Luminosidade solar – Portuguese" lang="pt" hreflang="pt" data-title="Luminosidade solar" data-language-autonym="Português" data-language-local-name="Portuguese" 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/Luminozitate_solar%C4%83" title="Luminozitate solară – Romanian" lang="ro" hreflang="ro" data-title="Luminozitate solară" data-language-autonym="Română" data-language-local-name="Romanian" 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%D0%BE%D0%BB%D0%BD%D0%B5%D1%87%D0%BD%D0%B0%D1%8F_%D1%81%D0%B2%D0%B5%D1%82%D0%B8%D0%BC%D0%BE%D1%81%D1%82%D1%8C" title="Солнечная светимость – Russian" lang="ru" hreflang="ru" data-title="Солнечная светимость" data-language-autonym="Русский" data-language-local-name="Russian" 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/Luminusitati_sulari" title="Luminusitati sulari – Sicilian" lang="scn" hreflang="scn" data-title="Luminusitati sulari" data-language-autonym="Sicilianu" data-language-local-name="Sicilian" class="interlanguage-link-target"><span>Sicilianu</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Solar_luminosity" title="Solar luminosity – Simple English" lang="en-simple" hreflang="en-simple" data-title="Solar luminosity" 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/Svietivos%C5%A5_Slnka" title="Svietivosť Slnka – Slovak" lang="sk" hreflang="sk" data-title="Svietivosť Slnka" data-language-autonym="Slovenčina" data-language-local-name="Slovak" 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/Son%C4%8Dev_izsev" title="Sončev izsev – Slovenian" lang="sl" hreflang="sl" data-title="Sončev izsev" data-language-autonym="Slovenščina" data-language-local-name="Slovenian" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Auringon_luminositeetti" title="Auringon luminositeetti – Finnish" lang="fi" hreflang="fi" data-title="Auringon luminositeetti" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Solluminositet" title="Solluminositet – Swedish" lang="sv" hreflang="sv" data-title="Solluminositet" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%81%E0%B8%B3%E0%B8%A5%E0%B8%B1%E0%B8%87%E0%B8%AA%E0%B9%88%E0%B8%AD%E0%B8%87%E0%B8%AA%E0%B8%A7%E0%B9%88%E0%B8%B2%E0%B8%87%E0%B8%94%E0%B8%A7%E0%B8%87%E0%B8%AD%E0%B8%B2%E0%B8%97%E0%B8%B4%E0%B8%95%E0%B8%A2%E0%B9%8C" title="กำลังส่องสว่างดวงอาทิตย์ – Thai" lang="th" hreflang="th" data-title="กำลังส่องสว่างดวงอาทิตย์" data-language-autonym="ไทย" data-language-local-name="Thai" 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/G%C3%BCne%C5%9Fsel_ayd%C4%B1nlatma_g%C3%BCc%C3%BC" title="Güneşsel aydınlatma gücü – Turkish" lang="tr" hreflang="tr" data-title="Güneşsel aydınlatma gücü" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk badge-Q70893996 mw-list-item" title=""><a href="https://uk.wikipedia.org/wiki/%D0%A1%D0%BE%D0%BD%D1%8F%D1%87%D0%BD%D0%B0_%D1%81%D0%B2%D1%96%D1%82%D0%BD%D1%96%D1%81%D1%82%D1%8C" title="Сонячна світність – Ukrainian" lang="uk" hreflang="uk" data-title="Сонячна світність" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/%C4%90%E1%BB%99_s%C3%A1ng_c%E1%BB%A7a_M%E1%BA%B7t_Tr%E1%BB%9Di" title="Độ sáng của Mặt Trời – Vietnamese" lang="vi" hreflang="vi" data-title="Độ sáng của Mặt Trời" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E5%A4%AA%E9%99%BD%E5%85%89%E5%BA%A6" title="太陽光度 – Chinese" lang="zh" hreflang="zh" data-title="太陽光度" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</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/Q843877#sitelinks-wikipedia" title="Edit interlanguage links" class="wbc-editpage">Edit links</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namespaces"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Solar_luminosity" title="View the content page [c]" accesskey="c"><span>Article</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Talk:Solar_luminosity" rel="discussion" title="Discuss improvements to the content page [t]" accesskey="t"><span>Talk</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="Change language variant" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">English</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> </div> </div> </nav> </div> <div id="right-navigation" class="vector-collapsible"> <nav aria-label="Views"> <div id="p-views" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-views" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-view" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Solar_luminosity"><span>Read</span></a></li><li id="ca-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Solar_luminosity&action=edit&oldid=935901824" title="Edit this page [e]" accesskey="e"><span>Edit</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Solar_luminosity&action=history" title="Past revisions of this page [h]" accesskey="h"><span>View history</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="Page tools"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-tools-dropdown" class="vector-dropdown-checkbox " aria-label="Tools" > <label id="vector-page-tools-dropdown-label" for="vector-page-tools-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">Tools</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">Tools</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">hide</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="More options" > <div class="vector-menu-heading"> Actions </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-more-view" class="selected vector-more-collapsible-item mw-list-item"><a href="/wiki/Solar_luminosity"><span>Read</span></a></li><li id="ca-more-edit" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Solar_luminosity&action=edit&oldid=935901824" title="Edit this page [e]" accesskey="e"><span>Edit</span></a></li><li id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Solar_luminosity&action=history"><span>View history</span></a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> General </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a href="/wiki/Special:WhatLinksHere/Solar_luminosity" title="List of all English Wikipedia pages containing links to this page [j]" accesskey="j"><span>What links here</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Special:RecentChangesLinked/Solar_luminosity" rel="nofollow" title="Recent changes in pages linked from this page [k]" accesskey="k"><span>Related changes</span></a></li><li id="t-upload" class="mw-list-item"><a href="/wiki/Wikipedia:File_Upload_Wizard" title="Upload files [u]" accesskey="u"><span>Upload file</span></a></li><li id="t-specialpages" class="mw-list-item"><a href="/wiki/Special:SpecialPages" title="A list of all special pages [q]" accesskey="q"><span>Special pages</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=Solar_luminosity&oldid=935901824" title="Permanent link to this revision of this page"><span>Permanent link</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=Solar_luminosity&action=info" title="More information about this page"><span>Page information</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=Special:CiteThisPage&page=Solar_luminosity&id=935901824&wpFormIdentifier=titleform" title="Information on how to cite this page"><span>Cite this page</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=Special:UrlShortener&url=https%3A%2F%2Fen.wikipedia.org%2Fw%2Findex.php%3Ftitle%3DSolar_luminosity%26diff%3Dprev%26oldid%3D935901824"><span>Get shortened URL</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=Special:QrCode&url=https%3A%2F%2Fen.wikipedia.org%2Fw%2Findex.php%3Ftitle%3DSolar_luminosity%26diff%3Dprev%26oldid%3D935901824"><span>Download QR code</span></a></li> </ul> </div> </div> <div id="p-coll-print_export" class="vector-menu mw-portlet mw-portlet-coll-print_export" > <div class="vector-menu-heading"> Print/export </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=Special:Book&bookcmd=render_article&arttitle=Solar+luminosity&returnto=Solar+luminosity&oldid=935901824&writer=rl" title="Download this page as a PDF file"><span>Download as PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=Solar_luminosity&printable=yes" title="Printable version of this page [p]" accesskey="p"><span>Printable version</span></a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> In other projects </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q843877" title="Structured data on this page hosted by Wikidata [g]" accesskey="g"><span>Wikidata item</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Page tools"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Appearance"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" 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">Appearance</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">hide</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 id="mw-indicator-mw-helplink" class="mw-indicator"><a href="https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Diff" target="_blank" class="mw-helplink"><span class="mw-helplink-icon"></span>Help</a></div> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-revslider-container"><span style='width: 100%; text-align: center;' id='ooui-php-1' class='mw-revslider-toggle-button oo-ui-widget oo-ui-widget-enabled oo-ui-buttonElement oo-ui-buttonElement-frameless oo-ui-indicatorElement oo-ui-labelElement oo-ui-buttonWidget' data-ooui='{"_":"OO.ui.ButtonWidget","rel":["nofollow"],"framed":false,"indicator":"down","label":"Browse history interactively","title":"Open revision slider","classes":["mw-revslider-toggle-button"]}'><a role='button' title='Open revision slider' tabindex='0' rel='nofollow' class='oo-ui-buttonElement-button'><span class='oo-ui-iconElement-icon oo-ui-iconElement-noIcon'></span><span class='oo-ui-labelElement-label'>Browse history interactively</span><span class='oo-ui-indicatorElement-indicator oo-ui-indicator-down'></span></a></span><div class="mw-revslider-slider-wrapper" style="display: none;"><div class="mw-revslider-placeholder"><div class="mw-revslider-spinner"><div class="mw-revslider-bounce"></div></div></div></div></div><div class="mw-diff-revision-history-links"><a href="/w/index.php?title=Solar_luminosity&diff=prev&oldid=935901736" class="mw-diff-revision-history-link-previous" title="Solar luminosity">← Previous edit</a><a href="/w/index.php?title=Solar_luminosity&diff=next&oldid=935901824" class="mw-diff-revision-history-link-next" title="Solar luminosity">Next edit →</a></div><div class="mw-diff-table-prefix" dir="ltr" lang="en"><div class="mw-diff-inline-legend oo-ui-element-hidden"><span class="mw-diff-inline-legend-del">Content deleted</span> <span class="mw-diff-inline-legend-ins">Content added</span></div><div class="ve-init-mw-diffPage-diffMode"><span class='oo-ui-widget oo-ui-widget-enabled oo-ui-buttonGroupWidget'><span aria-disabled='true' class='oo-ui-widget oo-ui-widget-disabled oo-ui-buttonElement oo-ui-buttonElement-framed oo-ui-iconElement oo-ui-labelElement oo-ui-buttonWidget'><a role='button' tabindex='-1' aria-disabled='true' rel='nofollow' class='oo-ui-buttonElement-button'><span class='oo-ui-iconElement-icon oo-ui-icon-eye oo-ui-image-invert'></span><span class='oo-ui-labelElement-label'>Visual</span><span class='oo-ui-indicatorElement-indicator oo-ui-indicatorElement-noIndicator oo-ui-image-invert'></span></a></span><span class='oo-ui-widget oo-ui-widget-enabled oo-ui-buttonElement oo-ui-buttonElement-framed oo-ui-iconElement oo-ui-labelElement oo-ui-buttonWidget oo-ui-buttonElement-active'><a role='button' tabindex='0' rel='nofollow' class='oo-ui-buttonElement-button'><span class='oo-ui-iconElement-icon oo-ui-icon-wikiText oo-ui-image-invert'></span><span class='oo-ui-labelElement-label'>Wikitext</span><span class='oo-ui-indicatorElement-indicator oo-ui-indicatorElement-noIndicator oo-ui-image-invert'></span></a></span></span></div><div class="mw-diffPage-inlineToggle-container"><div id='mw-diffPage-inline-toggle-switch-layout' class='oo-ui-layout oo-ui-labelElement oo-ui-fieldLayout oo-ui-fieldLayout-align-left' data-ooui='{"_":"OO.ui.FieldLayout","fieldWidget":{"tag":"mw-diffPage-inline-toggle-switch"},"$overlay":true,"label":"Inline","title":"Switches between inline format and two-column format"}'><div class='oo-ui-fieldLayout-body'><span class='oo-ui-fieldLayout-header'><label title='Switches between inline format and two-column format' id='ooui-php-2' class='oo-ui-labelElement-label'>Inline</label></span><div class='oo-ui-fieldLayout-field'><div id='mw-diffPage-inline-toggle-switch' title='Switches between inline format and two-column format' aria-checked='false' tabindex='0' role='switch' aria-labelledby='ooui-php-2' class='oo-ui-widget oo-ui-widget-enabled oo-ui-toggleWidget oo-ui-toggleWidget-off oo-ui-toggleSwitchWidget' data-ooui='{"_":"OO.ui.ToggleSwitchWidget","href":"\/w\/index.php?title=Solar_luminosity&diff=prev&oldid=935901824&diff-type=inline","value":false,"title":"Switches between inline format and two-column format"}'><span class='oo-ui-toggleSwitchWidget-glow'></span><a href='/w/index.php?title=Solar_luminosity&diff=prev&oldid=935901824&diff-type=inline'><span class='oo-ui-toggleSwitchWidget-grip'></span></a></div></div></div></div></div></div><table class="diff diff-type-table diff-contentalign-left diff-editfont-monospace" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" class="diff-otitle diff-side-deleted"><div id="mw-diff-otitle1"><strong><a href="/w/index.php?title=Solar_luminosity&oldid=935901736" title="Solar luminosity">Revision as of 13:19, 15 January 2020</a> <span class="mw-diff-edit"><a href="/w/index.php?title=Solar_luminosity&action=edit&oldid=935901736" title="Solar luminosity">edit</a></span><span class="mw-diff-timestamp" data-timestamp="2020-01-15T13:19:49Z"></span></strong></div><div id="mw-diff-otitle2"><a href="/wiki/Special:Contributions/80.180.16.240" class="mw-userlink mw-anonuserlink" title="Special:Contributions/80.180.16.240" data-mw-revid="935901736"><bdi>80.180.16.240</bdi></a> <span class="mw-usertoollinks">(<a href="/w/index.php?title=User_talk:80.180.16.240&action=edit&redlink=1" class="new mw-usertoollinks-talk" title="User talk:80.180.16.240 (page does not exist)">talk</a>)</span><div class="mw-diff-usermetadata"></div></div><div id="mw-diff-otitle3"> <span class="comment comment--without-parentheses"><span class="autocomment"><a href="#See_also">→<bdi dir="ltr">See also</bdi></a></span></span></div><div id="mw-diff-otitle5"></div><div id="mw-diff-otitle4"><a href="/w/index.php?title=Solar_luminosity&diff=prev&oldid=935901736" title="Solar luminosity" id="differences-prevlink">← Previous edit</a></div></td> <td colspan="2" class="diff-ntitle diff-side-added"><div id="mw-diff-ntitle1"><strong><a href="/w/index.php?title=Solar_luminosity&oldid=935901824" title="Solar luminosity">Revision as of 13:20, 15 January 2020</a> <span class="mw-diff-edit"><a href="/w/index.php?title=Solar_luminosity&action=edit&oldid=935901824" title="Solar luminosity">edit</a></span><span class="mw-diff-timestamp" data-timestamp="2020-01-15T13:20:40Z"></span> <span class="mw-diff-undo"><a href="/w/index.php?title=Solar_luminosity&action=edit&undoafter=935901736&undo=935901824" title=""Undo" reverts this edit and opens the edit form in preview mode. It allows adding a reason in the summary.">undo</a></span></strong></div><div id="mw-diff-ntitle2"><a href="/wiki/Special:Contributions/80.180.16.240" class="mw-userlink mw-anonuserlink" title="Special:Contributions/80.180.16.240" data-mw-revid="935901824"><bdi>80.180.16.240</bdi></a> <span class="mw-usertoollinks">(<a href="/w/index.php?title=User_talk:80.180.16.240&action=edit&redlink=1" class="new mw-usertoollinks-talk" title="User talk:80.180.16.240 (page does not exist)">talk</a>)</span><div class="mw-diff-usermetadata"></div></div><div id="mw-diff-ntitle3"> <span class="comment comment--without-parentheses"><span class="autocomment"><a href="#Determination">→<bdi dir="ltr">Determination</bdi></a></span></span></div><div id="mw-diff-ntitle5"></div><div id="mw-diff-ntitle4"><a href="/w/index.php?title=Solar_luminosity&diff=next&oldid=935901824" title="Solar luminosity" id="differences-nextlink">Next edit →</a></div></td> </tr><tr> <td colspan="2" class="diff-lineno">Line 11:</td> <td colspan="2" class="diff-lineno">Line 11:</td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><br /></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><br /></td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div>== Determination ==</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div>== Determination ==</div></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div>Solar [[radiant power]] is related to [[solar irradiance]] (the so-called ''solar constant''). Solar irradiance is responsible for the [[orbital forcing]] that causes the [[Milankovitch cycles|Earth secular cycles]], which determine Earthly glacial cycles. The mean irradiance at the top of the Earth's atmosphere is sometimes known as the solar irradiance, ''I''<sub>☉</sub>. Irradiance is defined as power per unit area, so the solar luminosity (total power emitted by the Sun) is the irradiance received at the Earth (solar irradiance) multiplied by the area of the sphere whose radius is the [[<del class="diffchange diffchange-inline">astronomic</del> <del class="diffchange diffchange-inline">unit</del>]], i.e. the mean distance between the Earth and the Sun:</div></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><div>Solar [[radiant power]] is related to [[solar irradiance]] (the so-called ''solar constant''). Solar irradiance is responsible for the [[orbital forcing]] that causes the [[Milankovitch cycles|Earth secular cycles]], which determine Earthly glacial cycles. The mean irradiance at the top of the Earth's atmosphere is sometimes known as the solar irradiance, ''I''<sub>☉</sub>. Irradiance is defined as power per unit area, so the solar luminosity (total power emitted by the Sun) is the irradiance received at the Earth (solar irradiance) multiplied by the area of the sphere whose radius is the [[<ins class="diffchange diffchange-inline">Astronomical</ins> <ins class="diffchange diffchange-inline">Unit</ins>]], i.e. the mean distance between the Earth and the Sun:</div></td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div>:<math>L_\odot = 4\pi k \, A^2\, I_\odot</math></div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div>:<math>L_\odot = 4\pi k \, A^2\, I_\odot</math></div></td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div>where ''A'' is the [[Astronomical unit|unit distance]] (the value of the [[astronomical unit]] in [[metre]]s) and ''k'' is a constant (whose value is very close to one) that reflects the fact that the mean distance from the Earth to the Sun is not exactly one [[astronomical unit]].</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div>where ''A'' is the [[Astronomical unit|unit distance]] (the value of the [[astronomical unit]] in [[metre]]s) and ''k'' is a constant (whose value is very close to one) that reflects the fact that the mean distance from the Earth to the Sun is not exactly one [[astronomical unit]].</div></td> </tr> </table><hr class='diff-hr' id='mw-oldid' /> <h2 class='diff-currentversion-title'>Revision as of 13:20, 15 January 2020</h2> <div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Solar_cycle" title="Solar cycle">Solar cycle</a> and <a href="/wiki/Solar_constant" title="Solar constant">Solar constant</a></div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Solar_evolution_(English).svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/6c/Solar_evolution_%28English%29.svg/330px-Solar_evolution_%28English%29.svg.png" decoding="async" width="330" height="235" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/6c/Solar_evolution_%28English%29.svg/495px-Solar_evolution_%28English%29.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/6c/Solar_evolution_%28English%29.svg/660px-Solar_evolution_%28English%29.svg.png 2x" data-file-width="544" data-file-height="388" /></a><figcaption>Evolution of the solar power, <a href="/wiki/Solar_radius" title="Solar radius">radius</a> and <a href="/wiki/Effective_temperature" title="Effective temperature">effective temperature</a> compared to the present-day Sun. After Ribas (2010)<sup id="cite_ref-ribas2010_1-0" class="reference"><a href="#cite_note-ribas2010-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></figcaption></figure> <p>The <i><b>standard solar power</b></i>, also called <i>standard solar luminosity</i>, <var>L</var><sub>☉</sub> is the average output of the <a href="/wiki/Sun" title="Sun">Sun</a> emitted in the form of <a href="/wiki/Photon" title="Photon">photons</a>. In <a href="/wiki/Astronomy" title="Astronomy">astronomy</a>, it is often used as a practical <a href="/wiki/Unit_of_measure" class="mw-redirect" title="Unit of measure">unit of measure</a> of <a href="/wiki/Radiant_power" class="mw-redirect" title="Radiant power">radiant power</a> to measure the <a href="/wiki/Luminosity" title="Luminosity">luminosity</a> of <a href="/wiki/Star" title="Star">stars</a>, <a href="/wiki/Galaxy" title="Galaxy">galaxies</a> and other celestial objects. Therefore, the solar luminosity constant has been established by the <a href="/wiki/International_Astronomical_Union" title="International Astronomical Union">International Astronomical Union</a> to have the conventional value<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> (in <a href="/wiki/SI_units" class="mw-redirect" title="SI units">SI units</a>) of: </p> <dl><dd><var>L</var><sub>☉</sub>=<span class="nowrap"><span data-sort-value="7026382800000000000♠"></span>3.828<span style="margin-left:0.25em;margin-right:0.15em;">×</span>10<sup>26</sup> <a href="/wiki/Watt" title="Watt">watt</a></span></dd></dl> <p>This does not include the <a href="/wiki/Solar_neutrino" title="Solar neutrino">solar neutrino</a> power, which is considered to be 2.3% of this value: one should add 0.023 <var>L</var><sub>☉</sub> to the former value when considering neutrinos.<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> The Sun is a weakly <a href="/wiki/Variable_star" title="Variable star">variable star</a>, and its actual luminosity therefore <a href="/wiki/Solar_variation" class="mw-redirect" title="Solar variation">fluctuates</a>.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> The major fluctuation is the eleven-year <a href="/wiki/Solar_cycle" title="Solar cycle">solar cycle</a> (sunspot cycle) that causes a periodic variation of about ±0.1%. Other variations over the last 200–300 years are thought to be much smaller than this.<sup id="cite_ref-Noed_5-0" class="reference"><a href="#cite_note-Noed-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> It is obviously related to the <b><a href="/wiki/Solar_constant" title="Solar constant">solar constant</a></b>, which is the average power per unit surface emitted by the sun. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Determination">Determination</h2></div> <p>Solar <a href="/wiki/Radiant_power" class="mw-redirect" title="Radiant power">radiant power</a> is related to <a href="/wiki/Solar_irradiance" title="Solar irradiance">solar irradiance</a> (the so-called <i>solar constant</i>). Solar irradiance is responsible for the <a href="/wiki/Orbital_forcing" title="Orbital forcing">orbital forcing</a> that causes the <a href="/wiki/Milankovitch_cycles" title="Milankovitch cycles">Earth secular cycles</a>, which determine Earthly glacial cycles. The mean irradiance at the top of the Earth's atmosphere is sometimes known as the solar irradiance, <i>I</i><sub>☉</sub>. Irradiance is defined as power per unit area, so the solar luminosity (total power emitted by the Sun) is the irradiance received at the Earth (solar irradiance) multiplied by the area of the sphere whose radius is the <a href="/wiki/Astronomical_Unit" class="mw-redirect" title="Astronomical Unit">Astronomical Unit</a>, i.e. the mean distance between the Earth and the Sun: </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 L_{\odot }=4\pi k\,A^{2}\,I_{\odot }}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>L</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>⊙<!-- ⊙ --></mo> </mrow> </msub> <mo>=</mo> <mn>4</mn> <mi>π<!-- π --></mi> <mi>k</mi> <mspace width="thinmathspace" /> <msup> <mi>A</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mspace width="thinmathspace" /> <msub> <mi>I</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>⊙<!-- ⊙ --></mo> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle L_{\odot }=4\pi k\,A^{2}\,I_{\odot }}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/4f6329009c9ccf2691763c58fd600175684f9e56" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:16.003ex; height:3.009ex;" alt="{\displaystyle L_{\odot }=4\pi k\,A^{2}\,I_{\odot }}"></span></dd></dl> <p>where <i>A</i> is the <a href="/wiki/Astronomical_unit" title="Astronomical unit">unit distance</a> (the value of the <a href="/wiki/Astronomical_unit" title="Astronomical unit">astronomical unit</a> in <a href="/wiki/Metre" title="Metre">metres</a>) and <i>k</i> is a constant (whose value is very close to one) that reflects the fact that the mean distance from the Earth to the Sun is not exactly one <a href="/wiki/Astronomical_unit" title="Astronomical unit">astronomical unit</a>. </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2></div> <ul><li><a href="/wiki/Astronomical_Unit" class="mw-redirect" title="Astronomical Unit">Astronomical Unit</a></li> <li><a href="/wiki/Solar_constant" title="Solar constant">Solar constant</a></li> <li><a href="/wiki/Solar_cycle" title="Solar cycle">Solar cycle</a></li> <li><a href="/wiki/Solar_constant" title="Solar constant">Solar irradiance</a></li> <li><a href="/wiki/Solar_mass" title="Solar mass">Solar mass</a></li> <li><a href="/wiki/Solar_radius" title="Solar radius">Solar radius</a></li> <li><a href="/wiki/Nuclear_fusion" title="Nuclear fusion">Nuclear fusion</a></li> <li><a href="/wiki/Radiant_power" class="mw-redirect" title="Radiant power">Radiant power</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist reflist-columns references-column-width" style="column-width: 30em;"> <ol class="references"> <li id="cite_note-ribas2010-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-ribas2010_1-0">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFRibas2010" class="citation cs2">Ribas, Ignasi (February 2010), "Solar and Stellar Variability: Impact on Earth and Planets, Proceedings of the International Astronomical Union, IAU Symposium", <i>Solar and Stellar Variability: Impact on Earth and Planets</i>, <b>264</b>: 3–18, <a href="/wiki/ArXiv_(identifier)" class="mw-redirect" title="ArXiv (identifier)">arXiv</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://arxiv.org/abs/0911.4872">0911.4872</a></span>, <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2010IAUS..264....3R">2010IAUS..264....3R</a>, <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1017%2FS1743921309992298">10.1017/S1743921309992298</a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Solar+and+Stellar+Variability%3A+Impact+on+Earth+and+Planets&rft.atitle=Solar+and+Stellar+Variability%3A+Impact+on+Earth+and+Planets%2C+Proceedings+of+the+International+Astronomical+Union%2C+IAU+Symposium&rft.volume=264&rft.pages=3-18&rft.date=2010-02&rft_id=info%3Aarxiv%2F0911.4872&rft_id=info%3Adoi%2F10.1017%2FS1743921309992298&rft_id=info%3Abibcode%2F2010IAUS..264....3R&rft.aulast=Ribas&rft.aufirst=Ignasi&rft_id=https%3A%2F%2Fwww.cambridge.org%2Fcore%2Fservices%2Faop-cambridge-core%2Fcontent%2Fview%2F293C0314C44A1A4AAF8175A3C288B50B%2FS1743921309992298a.pdf%2Fsun_and_stars_as_the_primary_energy_input_in_planetary_atmospheres.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASolar+luminosity" class="Z3988"></span> <span class="cs1-visible-error citation-comment"><code class="cs1-code">{{<a href="/wiki/Template:Citation" title="Template:Citation">citation</a>}}</code>: </span><span class="cs1-visible-error citation-comment"><code class="cs1-code">|contribution=</code> ignored (<a href="/wiki/Help:CS1_errors#chapter_ignored" title="Help:CS1 errors">help</a>)</span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.iau.org/static/resolutions/IAU2015_English.pdf">"Resolution B3 on recommended nominal conversion constants for selected solar and planetary properties"</a> <span class="cs1-format">(PDF)</span>. International Astronomical Union. 2015<span class="reference-accessdate">. Retrieved <span class="nowrap">5 June</span> 2018</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Resolution+B3+on+recommended+nominal+conversion+constants+for+selected+solar+and+planetary+properties&rft.pub=International+Astronomical+Union&rft.date=2015&rft_id=https%3A%2F%2Fwww.iau.org%2Fstatic%2Fresolutions%2FIAU2015_English.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASolar+luminosity" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBahcall1989" class="citation book cs1">Bahcall, John N. (1989). <span class="id-lock-registration" title="Free registration required"><a rel="nofollow" class="external text" href="https://archive.org/details/neutrinoastrophy0000bahc"><i>Neutrino Astrophysics</i></a></span>. <a href="/wiki/Cambridge_University_Press" title="Cambridge University Press">Cambridge University Press</a>. p. <a rel="nofollow" class="external text" href="https://archive.org/details/neutrinoastrophy0000bahc/page/79">79</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-521-37975-5" title="Special:BookSources/978-0-521-37975-5"><bdi>978-0-521-37975-5</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Neutrino+Astrophysics&rft.pages=79&rft.pub=Cambridge+University+Press&rft.date=1989&rft.isbn=978-0-521-37975-5&rft.aulast=Bahcall&rft.aufirst=John+N.&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fneutrinoastrophy0000bahc&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASolar+luminosity" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFVieiraNortonDudok_De_WitKretzschmar2012" class="citation journal cs1">Vieira, L. E. A.; Norton, A.; Dudok De Wit, T.; Kretzschmar, M.; Schmidt, G. A.; Cheung, M. C. M. (2012). <a rel="nofollow" class="external text" href="https://pubs.giss.nasa.gov/docs/2012/2012_Vieira_vi06000k.pdf">"How the inclination of Earth's orbit affects incoming solar irradiance"</a> <span class="cs1-format">(PDF)</span>. <i>Geophysical Research Letters</i>. <b>39</b> (16): L16104 (8 pp.). <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2012GeoRL..3916104V">2012GeoRL..3916104V</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1029%2F2012GL052950">10.1029/2012GL052950</a>. <a rel="nofollow" class="external text" href="https://hal-insu.archives-ouvertes.fr/insu-01179873">insu-01179873</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Geophysical+Research+Letters&rft.atitle=How+the+inclination+of+Earth%27s+orbit+affects+incoming+solar+irradiance&rft.volume=39&rft.issue=16&rft.pages=L16104+%288+pp.%29&rft.date=2012&rft_id=info%3Adoi%2F10.1029%2F2012GL052950&rft_id=info%3Abibcode%2F2012GeoRL..3916104V&rft.aulast=Vieira&rft.aufirst=L.+E.+A.&rft.au=Norton%2C+A.&rft.au=Dudok+De+Wit%2C+T.&rft.au=Kretzschmar%2C+M.&rft.au=Schmidt%2C+G.+A.&rft.au=Cheung%2C+M.+C.+M.&rft_id=https%3A%2F%2Fpubs.giss.nasa.gov%2Fdocs%2F2012%2F2012_Vieira_vi06000k.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASolar+luminosity" class="Z3988"></span></span> </li> <li id="cite_note-Noed-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-Noed_5-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFNoerdlinger2008" class="citation journal cs1">Noerdlinger, Peter D. (2008). "Solar Mass Loss, the Astronomical Unit, and the Scale of the Solar System". <i>Celestial Mechanics and Dynamical Astronomy</i>. <b>801</b>: 3807. <a href="/wiki/ArXiv_(identifier)" class="mw-redirect" title="ArXiv (identifier)">arXiv</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://arxiv.org/abs/0801.3807">0801.3807</a></span>. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2008arXiv0801.3807N">2008arXiv0801.3807N</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Celestial+Mechanics+and+Dynamical+Astronomy&rft.atitle=Solar+Mass+Loss%2C+the+Astronomical+Unit%2C+and+the+Scale+of+the+Solar+System&rft.volume=801&rft.pages=3807&rft.date=2008&rft_id=info%3Aarxiv%2F0801.3807&rft_id=info%3Abibcode%2F2008arXiv0801.3807N&rft.aulast=Noerdlinger&rft.aufirst=Peter+D.&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASolar+luminosity" class="Z3988"></span></span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="Further_reading">Further reading</h2></div> <ul><li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFSackmann,_I.-J.Boothroyd,_A._I.2003" class="citation cs2">Sackmann, I.-J.; Boothroyd, A. I. (2003), "Our Sun. V. A Bright Young Sun Consistent with Helioseismology and Warm Temperatures on Ancient Earth and Mars", <i><a href="/wiki/Astrophysical_Journal" class="mw-redirect" title="Astrophysical Journal">Astrophys. J.</a></i>, <b>583</b> (2): 1024–39, <a href="/wiki/ArXiv_(identifier)" class="mw-redirect" title="ArXiv (identifier)">arXiv</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://arxiv.org/abs/astro-ph/0210128">astro-ph/0210128</a></span>, <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2003ApJ...583.1024S">2003ApJ...583.1024S</a>, <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1086%2F345408">10.1086/345408</a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Astrophys.+J.&rft.atitle=Our+Sun.+V.+A+Bright+Young+Sun+Consistent+with+Helioseismology+and+Warm+Temperatures+on+Ancient+Earth+and+Mars&rft.volume=583&rft.issue=2&rft.pages=1024-39&rft.date=2003&rft_id=info%3Aarxiv%2Fastro-ph%2F0210128&rft_id=info%3Adoi%2F10.1086%2F345408&rft_id=info%3Abibcode%2F2003ApJ...583.1024S&rft.au=Sackmann%2C+I.-J.&rft.au=Boothroyd%2C+A.+I.&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASolar+luminosity" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFFoukal,_P.Fröhlich,_C.Spruit,_H.Wigley,_T._M._L.2006" class="citation cs2">Foukal, P.; Fröhlich, C.; Spruit, H.; Wigley, T. M. L. (2006), "Variations in solar luminosity and their effect on the Earth's climate", <i><a href="/wiki/Nature_(journal)" title="Nature (journal)">Nature</a></i>, <b>443</b> (7108): 161–66, <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2006Natur.443..161F">2006Natur.443..161F</a>, <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1038%2Fnature05072">10.1038/nature05072</a>, <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/16971941">16971941</a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Nature&rft.atitle=Variations+in+solar+luminosity+and+their+effect+on+the+Earth%27s+climate&rft.volume=443&rft.issue=7108&rft.pages=161-66&rft.date=2006&rft_id=info%3Apmid%2F16971941&rft_id=info%3Adoi%2F10.1038%2Fnature05072&rft_id=info%3Abibcode%2F2006Natur.443..161F&rft.au=Foukal%2C+P.&rft.au=Fr%C3%B6hlich%2C+C.&rft.au=Spruit%2C+H.&rft.au=Wigley%2C+T.+M.+L.&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASolar+luminosity" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFPelletier,_Jon_D.1996" class="citation cs2">Pelletier, Jon D. (1996), "Variations in Solar Luminosity from Timescales of Minutes to Months", <i><a href="/wiki/Astrophysical_Journal" class="mw-redirect" title="Astrophysical Journal">Astrophys. J.</a></i>, <b>463</b> (1): L41–L45, <a href="/wiki/ArXiv_(identifier)" class="mw-redirect" title="ArXiv (identifier)">arXiv</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://arxiv.org/abs/astro-ph/9510026">astro-ph/9510026</a></span>, <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1996ApJ...463L..41P">1996ApJ...463L..41P</a>, <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1086%2F310049">10.1086/310049</a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Astrophys.+J.&rft.atitle=Variations+in+Solar+Luminosity+from+Timescales+of+Minutes+to+Months&rft.volume=463&rft.issue=1&rft.pages=L41-L45&rft.date=1996&rft_id=info%3Aarxiv%2Fastro-ph%2F9510026&rft_id=info%3Adoi%2F10.1086%2F310049&rft_id=info%3Abibcode%2F1996ApJ...463L..41P&rft.au=Pelletier%2C+Jon+D.&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASolar+luminosity" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFStoykova,_D._A.Shopov,_Y._Y.Ford,_D.Georgiev,_L._N.1999" class="citation cs2">Stoykova, D. A.; Shopov, Y. Y.; Ford, D.; Georgiev, L. N.; et al. (1999), "Powerful Millennial-Scale Solar Luminosity Cycles and Their Influence Over Past Climates and Geomagnetic Field", <a rel="nofollow" class="external text" href="http://www.ncdc.noaa.gov/paleo/chapconf/stoykova_abs.html"><i>Proceedings of the AGU Chapman Conference: Mechanisms of Millennial Scale Global Climate Change</i></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Powerful+Millennial-Scale+Solar+Luminosity+Cycles+and+Their+Influence+Over+Past+Climates+and+Geomagnetic+Field&rft.btitle=Proceedings+of+the+AGU+Chapman+Conference%3A+Mechanisms+of+Millennial+Scale+Global+Climate+Change&rft.date=1999&rft.au=Stoykova%2C+D.+A.&rft.au=Shopov%2C+Y.+Y.&rft.au=Ford%2C+D.&rft.au=Georgiev%2C+L.+N.&rft.au=Tsankov%2C+L.&rft_id=http%3A%2F%2Fwww.ncdc.noaa.gov%2Fpaleo%2Fchapconf%2Fstoykova_abs.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASolar+luminosity" class="Z3988"></span></li></ul> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div> <ul><li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20120511173325/http://lasp.colorado.edu/lisird/">LISIRD: LASP Interactive Solar Irradiance Datacenter</a></li> <li><a rel="nofollow" class="external text" href="http://astro.unl.edu/classaction/animations/stellarprops/stellarlum.html">Stellar Luminosity Calculator</a></li> <li><a rel="nofollow" class="external text" href="https://archive.is/20091116175134/http://www.universetoday.com/guide-to-space/the-sun/solar-luminosity/">Solar Luminosity</a></li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20031113174453/http://web.sfc.keio.ac.jp/~masudako/edu/text/quatbook/variat/node4.html">Variation of Solar Luminosity</a></li></ul></div><!--esi <esi:include src="/esitest-fa8a495983347898/content" /> --><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1&useformat=desktop" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Solar_luminosity&oldid=935901824">https://en.wikipedia.org/w/index.php?title=Solar_luminosity&oldid=935901824</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Categories</a>: <ul><li><a href="/wiki/Category:Sun" title="Category:Sun">Sun</a></li><li><a href="/wiki/Category:Stellar_astronomy" title="Category:Stellar astronomy">Stellar astronomy</a></li><li><a href="/wiki/Category:Units_of_power" title="Category:Units of power">Units of power</a></li><li><a href="/wiki/Category:Units_of_measurement_in_astronomy" title="Category:Units of measurement in astronomy">Units of measurement in astronomy</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Hidden category: <ul><li><a href="/wiki/Category:CS1_errors:_chapter_ignored" title="Category:CS1 errors: chapter ignored">CS1 errors: chapter ignored</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last edited on 15 January 2020, at 13:20<span class="anonymous-show"> (UTC)</span>.</li> <li id="footer-info-copyright"><span class="nowraplinks">This version of the page has been <a href="/wiki/Help:Page_history" title="Help:Page history">revised</a>. Besides normal editing, the reason for revision may have been that this version contains factual inaccuracies, vandalism, or material not compatible with the <a href="/wiki/Wikipedia:Text_of_the_Creative_Commons_Attribution-ShareAlike_4.0_International_License" title="Wikipedia:Text of the Creative Commons Attribution-ShareAlike 4.0 International License">Creative Commons Attribution-ShareAlike 4.0 License</a>.</span></li> </ul> <ul id="footer-places"> <li id="footer-places-privacy"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Privacy_policy">Privacy policy</a></li> <li id="footer-places-about"><a href="/wiki/Wikipedia:About">About Wikipedia</a></li> <li id="footer-places-disclaimers"><a href="/wiki/Wikipedia:General_disclaimer">Disclaimers</a></li> <li id="footer-places-contact"><a href="//en.wikipedia.org/wiki/Wikipedia:Contact_us">Contact Wikipedia</a></li> <li id="footer-places-wm-codeofconduct"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Universal_Code_of_Conduct">Code of Conduct</a></li> <li id="footer-places-developers"><a href="https://developer.wikimedia.org">Developers</a></li> <li id="footer-places-statslink"><a href="https://stats.wikimedia.org/#/en.wikipedia.org">Statistics</a></li> <li id="footer-places-cookiestatement"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Cookie_statement">Cookie statement</a></li> <li id="footer-places-mobileview"><a href="//en.m.wikipedia.org/w/index.php?title=Solar_luminosity&diff=prev&oldid=935901824&mobileaction=toggle_view_mobile" class="noprint stopMobileRedirectToggle">Mobile view</a></li> </ul> <ul id="footer-icons" class="noprint"> <li id="footer-copyrightico"><a href="https://wikimediafoundation.org/" class="cdx-button cdx-button--fake-button cdx-button--size-large cdx-button--fake-button--enabled"><img src="/static/images/footer/wikimedia-button.svg" width="84" height="29" alt="Wikimedia Foundation" loading="lazy"></a></li> <li id="footer-poweredbyico"><a href="https://www.mediawiki.org/" class="cdx-button cdx-button--fake-button cdx-button--size-large cdx-button--fake-button--enabled"><img src="/w/resources/assets/poweredby_mediawiki.svg" alt="Powered by MediaWiki" width="88" height="31" loading="lazy"></a></li> </ul> </footer> </div> </div> </div> <div class="vector-settings" id="p-dock-bottom"> <ul></ul> </div><script>(RLQ=window.RLQ||[]).push(function(){mw.config.set({"wgHostname":"mw-web.codfw.main-5c59558b9d-sh58c","wgBackendResponseTime":606,"wgPageParseReport":{"limitreport":{"cputime":"0.243","walltime":"0.344","ppvisitednodes":{"value":580,"limit":1000000},"postexpandincludesize":{"value":22860,"limit":2097152},"templateargumentsize":{"value":118,"limit":2097152},"expansiondepth":{"value":8,"limit":100},"expensivefunctioncount":{"value":3,"limit":500},"unstrip-depth":{"value":1,"limit":20},"unstrip-size":{"value":29519,"limit":5000000},"entityaccesscount":{"value":0,"limit":400},"timingprofile":["100.00% 265.251 1 -total"," 50.30% 133.431 1 Template:Reflist"," 43.30% 114.857 5 Template:Citation"," 21.15% 56.100 1 Template:See_also"," 14.12% 37.442 1 Template:Val"," 4.82% 12.787 2 Template:Cite_journal"," 3.14% 8.338 1 Template:Cite_book"," 1.91% 5.073 1 Template:Cite_web"," 0.89% 2.371 3 Template:Solar_luminosity"," 0.86% 2.288 1 Template:Main_other"]},"scribunto":{"limitreport-timeusage":{"value":"0.154","limit":"10.000"},"limitreport-memusage":{"value":6526540,"limit":52428800}},"cachereport":{"origin":"mw-web.codfw.main-5c59558b9d-sh58c","timestamp":"20241129090111","ttl":2592000,"transientcontent":false}}});});</script> <script type="application/ld+json">{"@context":"https:\/\/schema.org","@type":"Article","name":"Solar luminosity","url":"https:\/\/en.wikipedia.org\/wiki\/Solar_luminosity","sameAs":"http:\/\/www.wikidata.org\/entity\/Q843877","mainEntity":"http:\/\/www.wikidata.org\/entity\/Q843877","author":{"@type":"Organization","name":"Contributors to Wikimedia projects"},"publisher":{"@type":"Organization","name":"Wikimedia Foundation, Inc.","logo":{"@type":"ImageObject","url":"https:\/\/www.wikimedia.org\/static\/images\/wmf-hor-googpub.png"}},"datePublished":"2003-04-15T10:35:28Z","dateModified":"2020-01-15T13:20:40Z","image":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/6\/6c\/Solar_evolution_%28English%29.svg","headline":"unit of radiant flux in astronomy"}</script> </body> </html>