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<!doctype html> <html> <head><script type="text/javascript" src="https://web-static.archive.org/_static/js/bundle-playback.js?v=7YQSqjSh" charset="utf-8"></script> <script type="text/javascript" src="https://web-static.archive.org/_static/js/wombat.js?v=txqj7nKC" charset="utf-8"></script> <script>window.RufflePlayer=window.RufflePlayer||{};window.RufflePlayer.config={"autoplay":"on","unmuteOverlay":"hidden"};</script> <script type="text/javascript" src="https://web-static.archive.org/_static/js/ruffle/ruffle.js"></script> <script type="text/javascript"> __wm.init("https://web.archive.org/web"); __wm.wombat("https://antwrp.gsfc.nasa.gov/apod/astropix.html","20211016053652","https://web.archive.org/","web","https://web-static.archive.org/_static/", "1634362612"); </script> <link rel="stylesheet" type="text/css" href="https://web-static.archive.org/_static/css/banner-styles.css?v=p7PEIJWi" /> <link rel="stylesheet" type="text/css" href="https://web-static.archive.org/_static/css/iconochive.css?v=3PDvdIFv" />  <title>Astronomy Picture of the Day </title>  <meta name="orgcode" content="661"> <meta name="rno" content="phillip.a.newman"> <meta name="content-owner" content="Jerry.T.Bonnell.1"> <meta name="webmaster" content="Stephen.F.Fantasia.1"> <meta name="description" content="A different astronomy and space science related image is featured each day, along with a brief explanation.">  <meta name="viewport" content="width=device-width, initial-scale=1"> <meta name="keywords" content="mona lisa, moon, optical art">  <script id="_fed_an_ua_tag" src="//web.archive.org/web/20211016053652js_/https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=NASA"> </script> </head> <body bgcolor="#F4F4FF" text="#000000" link="#0000FF" vlink="#7F0F9F" alink="#FF0000"> <center> <h1> Astronomy Picture of the Day </h1> <p> <a href="archivepix.html">Discover the cosmos!</a> Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. <p> 2021 October 16 <br> <a href="image/2110/Moonalisa_base_corr.jpg"> <img src="/web/20211016053652im_/https://antwrp.gsfc.nasa.gov/apod/image/2110/Moonalisa_Example1024.jpg" alt="See Explanation. Clicking on the picture will download the highest resolution version available." style="max-width:100%"></a> </center> <center> <b> The Moona Lisa </b> <br> <b>Image Credit & <a href="lib/about_apod.html#srapply">Copyright</a>:</b> <a href="https://web.archive.org/web/20211016053652/https://en.wikipedia.org/wiki/Gianni_A._Sarcone">Gianni Sarcone</a> and <a href="https://web.archive.org/web/20211016053652/https://greenflash.photo/about-me/">Marcella Giulia Pace</a> </center> <p> <b> Explanation: </b> <a href="ap201111.html">Only natural colors</a> of the Moon in planet Earth's sky appear in this creative visual presentation. Arranged <a href="https://web.archive.org/web/20211016053652/https://en.wikipedia.org/wiki/Gianni_A._Sarcone#/media/File:Gianni_Sarcone,_2001,_Master_of_Number,_mixed_media_-_collage,_76_x_76_cm,_Museum_of_Illusions,_Kuala_Lumpur.jpg">as pixels</a> in a framed image, the lunar disks were photographed at different times. Their varying hues are ultimately due to reflected sunlight affected by changing atmospheric conditions and the <a href="https://web.archive.org/web/20211016053652/https://svs.gsfc.nasa.gov/4874">alignment</a> geometry of Moon, Earth, and Sun. Here, the darkest lunar disks are the <a href="ap210710.html">colors of earthshine</a>. A description of earthshine, in terms of sunlight reflected by Earth's oceans illuminating the Moon's dark surface, was written over 500 years ago by Leonardo da Vinci. But stand farther back from your monitor or just shift your gaze to the smaller versions of the image. You might also see one of da Vinci's most famous <a href="https://web.archive.org/web/20211016053652/https://artsandculture.google.com/asset/portrait-of-lisa-gherardini-wife-of-francesco-del-giocondo-known-as-monna-lisa-la-gioconda-or-mona-lisa-1503-1519-leonardo-di-ser-piero-da-vinci-dit-l%C3%A9onard-de-vinci-1452-1519-paris-mus%C3%A9e-du-louvre/uQGZ28lYUJ3OGw?hl=en">works of art</a>. <p> <center> <b>Tonight:</b> <a href="https://web.archive.org/web/20211016053652/https://blogs.nasa.gov/Watch_the_Skies/2021/10/12/international-observe-the-moon-night-2021/">International Observe the Moon Night</a> <br> <b> Tomorrow's picture: </b>looking through gravity's lens <p> <hr> <a href="ap211015.html"><</a> | <a href="archivepix.html">Archive</a> | <a href="lib/apsubmit2015.html">Submissions</a> | <a href="lib/aptree.html">Index</a> | <a href="https://web.archive.org/web/20211016053652/https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search">Search</a> | <a href="calendar/allyears.html">Calendar</a> | <a href="/web/20211016053652/https://antwrp.gsfc.nasa.gov/apod.rss">RSS</a> | <a href="lib/edlinks.html">Education</a> | <a href="lib/about_apod.html">About APOD</a> | <a href="https://web.archive.org/web/20211016053652/http://asterisk.apod.com/discuss_apod.php?date=211016">Discuss</a> | <a href="ap211017.html">></a> <hr><p> <b> Authors & editors: </b> <a href="https://web.archive.org/web/20211016053652/http://www.phy.mtu.edu/faculty/Nemiroff.html">Robert Nemiroff</a> (<a href="https://web.archive.org/web/20211016053652/http://www.phy.mtu.edu/">MTU</a>) & <a href="https://web.archive.org/web/20211016053652/https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html">Jerry Bonnell</a> (<a href="https://web.archive.org/web/20211016053652/http://www.astro.umd.edu/">UMCP</a>)<br> <b>NASA Official: </b> Phillip Newman <a href="lib/about_apod.html#srapply">Specific rights apply</a>.<br> <a href="https://web.archive.org/web/20211016053652/https://www.nasa.gov/about/highlights/HP_Privacy.html">NASA Web Privacy Policy and Important Notices</a><br> <b>A service of:</b> <a href="https://web.archive.org/web/20211016053652/https://astrophysics.gsfc.nasa.gov/">ASD</a> at <a href="https://web.archive.org/web/20211016053652/https://www.nasa.gov/">NASA</a> / <a href="https://web.archive.org/web/20211016053652/https://www.nasa.gov/centers/goddard/">GSFC</a> <br><b>&</b> <a href="https://web.archive.org/web/20211016053652/http://www.mtu.edu/">Michigan Tech. 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