{"id":23033,"date":"2019-07-22T05:00:35","date_gmt":"2019-07-22T05:00:35","guid":{"rendered":"http:\/\/finn-family.com\/?p=23033"},"modified":"2019-07-22T05:00:35","modified_gmt":"2019-07-22T05:00:35","slug":"hdr-earths-circular-shadow-on-the-moon","status":"publish","type":"post","link":"http:\/\/finn-family.com\/?p=23033","title":{"rendered":"HDR: Earths Circular Shadow on the Moon"},"content":{"rendered":"<div><img src='https:\/\/apod.nasa.gov\/image\/1907\/PartialLunarEclipse_Fattinnanzi_1080.jpg' style='max-width:600px;' \/><\/p>\n<div>What could create such a large circular shadow on the Moon? The Earth. Last week&#8217;s full Moon &#8212; the Buck Moon &#8212; was so full that it fell almost exactly in a line with the Sun and the Earth. When that happens the Earth casts its shadow onto the Moon. The circularity of the Earth&#8217;s shadow on the Moon was commented on by Aristotle and so has been noticed since at least the 4th century BC. What&#8217;s new is humanity&#8217;s ability to record this shadow with such high dynamic range (HDR). The featured HDR composite of last week&#8217;s partial lunar eclipse combines 15 images and include an exposure as short as 1\/400th of a second &#8212; so as not to overexpose the brightest part &#8212; and an exposure that lasted five seconds &#8212; to bring up the dimmest part. This dimmest part &#8212; inside Earth&#8217;s umbra &#8212; is not completely dark because some light is refracted through the Earth&#8217;s atmosphere onto the Moon. A total lunar eclipse will occur next in 2021 May. via NASA <a href=\"https:\/\/apod.nasa.gov\/apod\/ap190722.html\"><\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>What could create such a large circular shadow on the Moon? The Earth. Last week&#8217;s full Moon &#8212; the Buck Moon &#8212; was so full that it fell almost exactly <a href=\"http:\/\/finn-family.com\/?p=23033\" class=\"more-link\">[&hellip;]<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"Layout":"","footnotes":"","_links_to":"","_links_to_target":""},"categories":[9],"tags":[10,12],"class_list":["entry","author-admin","post-23033","post","type-post","status-publish","format-standard","category-whatsup","tag-ifttt","tag-nasa"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"http:\/\/finn-family.com\/index.php?rest_route=\/wp\/v2\/posts\/23033","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/finn-family.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/finn-family.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/finn-family.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/finn-family.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=23033"}],"version-history":[{"count":1,"href":"http:\/\/finn-family.com\/index.php?rest_route=\/wp\/v2\/posts\/23033\/revisions"}],"predecessor-version":[{"id":23034,"href":"http:\/\/finn-family.com\/index.php?rest_route=\/wp\/v2\/posts\/23033\/revisions\/23034"}],"wp:attachment":[{"href":"http:\/\/finn-family.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=23033"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/finn-family.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=23033"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/finn-family.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=23033"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}