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<title>Crepuscular rays</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Crepuscular rays</span></span>

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<div class="side-box-text plainlist">Look up <i><b><a href="https://en.wiktionary.org/wiki/crepuscular_ray" class="extiw external" title="wiktionary:crepuscular ray">crepuscular ray</a></b></i> in Wiktionary, the free dictionary.</div></div>

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<p><b>Crepuscular rays</b>, sometimes colloquially referred to as <b>god rays</b>, are <a href="Sunbeam" title="Sunbeam">sunbeams</a> that originate when the <a href="Sun" title="Sun">Sun</a> appears to be just above or below a layer of clouds, during the <a href="Twilight" title="Twilight">twilight</a> period.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> <a href="Crepuscular" class="mw-redirect" title="Crepuscular">Crepuscular</a> rays are noticeable when the <a href="Contrast_(vision)" title="Contrast (vision)">contrast</a> between light and dark is most obvious. Crepuscular comes from the Latin word <i lang="la"><a href="https://en.wiktionary.org/wiki/crepusculum#Latin" class="extiw external" title="wikt:crepusculum">crepusculum</a></i>, meaning "twilight".<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> Crepuscular rays usually appear orange because <a href="Optical_path" title="Optical path">the path</a> through the atmosphere at <a href="Dawn" title="Dawn">dawn</a> and <a href="Dusk" title="Dusk">dusk</a> passes through up to 40 times as much air as rays from a high Sun at <a href="Noon" title="Noon">noon</a>. <a href="Particulates" class="mw-redirect" title="Particulates">Particles in the air</a> <a href="Light_scattering_by_particles" title="Light scattering by particles">scatter</a> short-<a href="Wavelength" title="Wavelength">wavelength</a> light (blue and green) through <a href="Rayleigh_scattering" title="Rayleigh scattering">Rayleigh scattering</a> much more strongly than longer-wavelength yellow and red light.

</p><p>Crepuscular rays appear as divergent beams emanating from a distant source, inspite of the rays from the Sun being parallel when they arrive, because of <a href="Perspective_(graphical)" title="Perspective (graphical)">perspective</a>. The point from which the divergent rays appear to emerge from is really a <a href="Vanishing_point" title="Vanishing point">vanishing point</a> for parallel rays of sunlight.<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>

</p><p>Loosely, the term <i>crepuscular rays</i> is sometimes extended to the general phenomenon of rays of <a href="Sunlight" title="Sunlight">sunlight</a> that appear to converge at a point in the sky, irrespective of time of day.<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><sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup>

</p><p>A rare related phenomenon are <a href="Anticrepuscular_rays" title="Anticrepuscular rays">anticrepuscular rays</a> which can appear at the same time (and coloration) as crepuscular rays but in the opposite direction of the setting sun (east rather than west).

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<div class="mw-heading mw-heading2"><h2 id="Gallery">Gallery</h2></div>

<div class="gallerytext">Orbital view of crepuscular rays</div>

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<div class="gallerytext">Sunset at <a href="Heron_Island%2C_Queensland" class="mw-redirect" title="Heron Island, Queensland">Heron Island, Queensland</a>, Australia (April 2023)</div>

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<div class="gallerytext">Crepuscular rays before sunset, <a href="Tikve%C5%A1" class="mw-redirect" title="Tikveš">Tikveš</a></div>

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<ul><li><a href="Earth's_shadow" title="Earth's shadow">Earth's shadow</a> – Shadow that Earth itself casts through its atmosphere and into outer space</li>

<li><a href="Foreglow" class="mw-redirect" title="Foreglow">Foreglow</a> – Whitish or rosy light during twilight or after sunset<span style="display:none" class="category-annotation-with-redirected-description">Pages displaying short descriptions of redirect targets</span></li></ul>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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</style><cite id="CITEREFNaylor2002" class="citation book cs1">Naylor, John (2002). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=ZQOJGerV2IcC&pg=PA77"><i>Out of the Blue: A 24-Hour Skywatcher's Guide</i></a>. <a href="Cambridge_University_Press" title="Cambridge University Press">Cambridge University Press</a>. pp. <span class="nowrap">77–</span>79. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>9780521809252</bdi>.</cite></span>

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<li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><cite id="CITEREFEdens" class="citation web cs1">Edens, Harald. <a rel="nofollow" class="external text" href="http://www.weatherscapes.com/album.php?cat=optics&subcat=crepuscular_rays">"Crepuscular rays"</a>. weatherscapes.com<span class="reference-accessdate">. Retrieved <span class="nowrap">2011-11-01</span></span>.</cite></span>

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<li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external free" href="http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/opt/air/crp.rxml">http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/opt/air/crp.rxml</a></span>

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<li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.atoptics.co.uk/atoptics/ray1.htm">"Crepuscular Rays"</a>. 16 September 2023.</cite></span>

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<li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.weatheronline.co.uk/reports/wxfacts/Crepuscular-rays.htm">"Weather Facts: Crepuscular rays | weatheronline.co.uk"</a>.</cite></span>

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<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>

<ul><li><span class="noviewer" typeof="mw:File"></span> Media related to <a href="https://commons.wikimedia.org/wiki/Category:Crepuscular_rays" class="extiw external" title="commons:Category:Crepuscular rays">Crepuscular rays</a> at Wikimedia Commons</li></ul>

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</style><div id="The_Sun300" style="font-size:114%;margin:0 4em"><a href="Sun" title="Sun">The Sun</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Standard_solar_model" title="Standard solar model">Internal structure</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="Radiative_zone" title="Radiative zone">Radiative zone</a></li>

<li><a href="Tachocline" title="Tachocline">Tachocline</a></li>

<li><a href="Convection_zone" title="Convection zone">Convection zone</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Stellar_atmosphere" title="Stellar atmosphere">Atmosphere</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center;"><a href="Photosphere" title="Photosphere">Photosphere</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Supergranulation" title="Supergranulation">Supergranulation</a></li>

<li><a href="Solar_granule" title="Solar granule">Granule</a></li>

<li><a href="Solar_facula" title="Solar facula">Faculae</a></li>

<li><a href="Sunspot" title="Sunspot">Sunspot</a></li>

<li><a href="Ellerman_bomb" title="Ellerman bomb">Ellerman bomb</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center;"><a href="Chromosphere" title="Chromosphere">Chromosphere</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Solar_plage" title="Solar plage">Plage</a></li>

<li><a href="Solar_spicule" title="Solar spicule">Spicule</a></li>

<li><a href="Moreton_wave" title="Moreton wave">Moreton wave</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center;"><a href="Stellar_corona" title="Stellar corona">Corona</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Solar_transition_region" title="Solar transition region">Transition region</a></li>

<li><a href="Coronal_hole" title="Coronal hole">Coronal hole</a></li>

<li><a href="Coronal_loop" title="Coronal loop">Coronal loop</a></li>

<li><a href="Coronal_mass_ejection" title="Coronal mass ejection">Coronal mass ejection</a></li>

<li><a href="Nanoflare" title="Nanoflare">Nanoflare</a></li>

<li><a href="Solar_prominence" title="Solar prominence">Prominence</a></li>

<li><a href="Helmet_streamer" title="Helmet streamer">Helmet streamer</a></li>

<li><a href="Supra-arcade_downflows" title="Supra-arcade downflows">Supra-arcade downflows</a></li>

<li><a href="Alfv%C3%A9n_surface" title="Alfvén surface">Alfvén surface</a></li>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Solar_variation" class="mw-redirect" title="Solar variation">Variation</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Solar_cycle" title="Solar cycle">Solar cycle</a>

<ul><li><a href="List_of_solar_cycles" title="List of solar cycles">List of solar cycles</a></li></ul></li>

<li><a href="Active_region" title="Active region">Active region</a></li>

<li><a href="Solar_maximum" title="Solar maximum">Solar maximum</a></li>

<li><a href="Solar_minimum" title="Solar minimum">Solar minimum</a></li>

<li><a href="Sunspot_number" title="Sunspot number">Sunspot number</a></li>

<li><a href="Solar_wind" title="Solar wind">Solar wind</a>

<ul><li><a href="Solar_wind_turbulence" title="Solar wind turbulence">Solar wind turbulence</a></li></ul></li>

<li><a href="Magnetic_switchback" title="Magnetic switchback">Magnetic switchback</a></li>

<li><a href="Solar_flare" title="Solar flare">Flare</a></li>

<li><a href="Helioseismology" title="Helioseismology">Helioseismology</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Heliosphere" title="Heliosphere">Heliosphere</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Corotating_interaction_region" title="Corotating interaction region">Corotating interaction region</a></li>

<li><a href="Heliospheric_current_sheet" title="Heliospheric current sheet">Current sheet</a></li>

<li><a href="Heliosphere#Termination_shock" title="Heliosphere">Termination shock</a></li>

<li><a href="Heliosphere#Heliosheath" title="Heliosphere">Heliosheath</a></li>

<li><a href="Heliopause_(astronomy)" class="mw-redirect" title="Heliopause (astronomy)">Heliopause</a></li>

<li><a href="Bow_shock" title="Bow shock">Bow shock</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Solar_eclipse" title="Solar eclipse">Eclipse</a>

<ul><li><a href="Eclipses_in_mythology_and_culture" title="Eclipses in mythology and culture">In mythology and culture</a></li>

<li><a href="Lunar_eclipse" title="Lunar eclipse">Lunar eclipse</a></li></ul></li>

<li><a href="Heliophysics" title="Heliophysics">Heliophysics</a></li>

<li><a href="The_Sun_in_culture" class="mw-redirect" title="The Sun in culture">In culture</a>

<ul><li><a href="Solar_deity" title="Solar deity">Solar deity</a>

<li><a href="Sun_in_fiction" title="Sun in fiction">Sun in fiction</a></li>

<li><a href="Solar_activity" class="mw-redirect" title="Solar activity">Solar activity</a></li>

<li><a href="Solar_astronomy" class="mw-redirect" title="Solar astronomy">Solar astronomy</a></li>

<li><a href="Solar_dynamo" title="Solar dynamo">Solar dynamo</a></li>

<li><a href="Solar_energy" title="Solar energy">Solar energy</a></li>

<li><a href="Solar_neutrino" title="Solar neutrino">Solar neutrino</a></li>

<li><a href="Solar_observation" title="Solar observation">Solar observation</a></li>

<li><a href="Solar_phenomena" title="Solar phenomena">Solar phenomena</a></li>

<li><a href="Solar_physics" title="Solar physics">Solar physics</a></li>

<li><a href="Solar_radio_emission" title="Solar radio emission">Solar radio emission</a></li>

<li><a href="Solar_System" title="Solar System">Solar System</a></li>

<li><a href="Solar_telescope" title="Solar telescope">Solar telescope</a></li>

<li><a href="Solar_time" title="Solar time">Solar time</a></li>

<li><a href="Space_climate" title="Space climate">Space climate</a></li>

<li><a href="Space_weather" title="Space weather">Space weather</a></li>

<li><a href="Standard_solar_model" title="Standard solar model">Standard solar model</a></li>

<li><a href="Sunlight" title="Sunlight">Sunlight radiation</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Stellar_classification" title="Stellar classification">Spectral class</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"><a href="G-type_main-sequence_star" title="G-type main-sequence star">G-type main-sequence star</a></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Exploration</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Solar_observatory" class="mw-redirect" title="Solar observatory">Solar observatory</a></li>

<li><a href="List_of_heliophysics_missions" title="List of heliophysics missions">List of heliophysics missions</a></li>

<li>Category:Missions to the Sun</li></ul>

</div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div>

<ul><li><span class="noviewer" typeof="mw:File"><span title="Category"></span></span> Category</li></ul>

</div></td></tr></tbody></table></div>

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