{"id":251481,"date":"2010-01-30T11:17:21","date_gmt":"2010-01-30T16:17:21","guid":{"rendered":"http:\/\/blogs.discovermagazine.com\/badastronomy\/?p=10914"},"modified":"2010-01-30T11:17:21","modified_gmt":"2010-01-30T16:17:21","slug":"a-marvelous-night-for-a-moon-and-mars-dance-bad-astronomy","status":"publish","type":"post","link":"https:\/\/mereja.media\/index\/251481","title":{"rendered":"A marvelous night for a Moon (and Mars) dance | Bad Astronomy"},"content":{"rendered":"<p>Were you out last night to see the Moon and Mars together? It was a lovely get-together! I took some pictures, and here&#8217;s the best one:<\/p>\n<p><center><a rel=\"nofollow\"  href=\"http:\/\/www.flickr.com\/photos\/badastronomy\/4315390096\/\"><img decoding=\"async\" src=\"http:\/\/farm5.static.flickr.com\/4070\/4315390096_6bf4ef7508.jpg\"><\/a><\/center><br clear=\"all\"><\/p>\n<p>Mars is the reddish &#8220;star&#8221; to the left of the Moon. A couple of actual stars are visible as well, and the pink blob on the left is a reflection of the Moon inside the camera. <\/p>\n<p>Funny, you can barely see Mars in the picture, but it was really obvious by eye. That&#8217;s because cameras see things linearly &#8212; an object twice as luminous as another will appear twice as bright in a picture &#8212; while our eyes see things <em>logarithmically<\/em> &#8212; a mathematical function that lets our eyes see a much larger range of brightness based on multiplication, not addition. It&#8217;s actually <a rel=\"nofollow\"  href=\"http:\/\/www.telescope-optics.net\/eye_spectral_response.htm\">a bit more complicated than this<\/a>, but the point is while to the camera the Moon was vastly brighter than Mars (about 30,000x as bright!), to my eye the difference wasn&#8217;t nearly as much (only about 10x as bright). This allows our eye to detect faint and bright objects at the same time, which a camera can&#8217;t do easily. <\/p>\n<p>You may have read that the Moon looked so bright last night because it was at perigee, the point in its orbit when it&#8217;s closest to Earth. Honestly, that makes no difference to the casual observer. While it really was a bit bigger and brighter, the difference over a normal full Moon is pretty small, and you don&#8217;t have anything to compare it with. If you could have superimposed a normal full Moon next to the Moon last night you might have seen a difference, but with just the one Moon sitting there you&#8217;d never notice. <\/p>\n<p>This reminds me of the time in 1999 when people said <a rel=\"nofollow\"  href=\"http:\/\/www.badastronomy.com\/bitesize\/fullmoon_perigee.html\">the perigee full Moon would be so bright you could drive at night without headlights<\/a>! Yeah. Bad idea.<\/p>\n<p>But I do hope that some of the hype got people outside and noticing the sky. It&#8217;s amazing what you can see, what lovely things await you, if you simply <em>look up<\/em>.<\/p>\n<p><a rel=\"nofollow\"  href=\"http:\/\/feedads.g.doubleclick.net\/~a\/dq1rU61LksvI-yRtVmCdy_lNgfA\/0\/da\"><img decoding=\"async\" src=\"http:\/\/feedads.g.doubleclick.net\/~a\/dq1rU61LksvI-yRtVmCdy_lNgfA\/0\/di\" border=\"0\" ismap><\/a><br \/>\n<a rel=\"nofollow\"  href=\"http:\/\/feedads.g.doubleclick.net\/~a\/dq1rU61LksvI-yRtVmCdy_lNgfA\/1\/da\"><img decoding=\"async\" src=\"http:\/\/feedads.g.doubleclick.net\/~a\/dq1rU61LksvI-yRtVmCdy_lNgfA\/1\/di\" border=\"0\" ismap><\/a><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/feeds.feedburner.com\/~r\/BadAstronomyBlog\/~4\/TgFZaqj_-Ik\" height=\"1\" width=\"1\"\/><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/feeds.feedburner.com\/~r\/DiscoverMag\/~4\/YH8Zscl6tKU\" height=\"1\" width=\"1\"\/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Were you out last night to see the Moon and Mars together? It was a lovely get-together! I took some pictures, and here&#8217;s the best one: Mars is the reddish &#8220;star&#8221; to the left of the Moon. A couple of actual stars are visible as well, and the pink blob on the left is a [&hellip;]<\/p>\n","protected":false},"author":641,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-251481","post","type-post","status-publish","format-standard","hentry","category-news"],"_links":{"self":[{"href":"https:\/\/mereja.media\/index\/wp-json\/wp\/v2\/posts\/251481","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mereja.media\/index\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mereja.media\/index\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mereja.media\/index\/wp-json\/wp\/v2\/users\/641"}],"replies":[{"embeddable":true,"href":"https:\/\/mereja.media\/index\/wp-json\/wp\/v2\/comments?post=251481"}],"version-history":[{"count":0,"href":"https:\/\/mereja.media\/index\/wp-json\/wp\/v2\/posts\/251481\/revisions"}],"wp:attachment":[{"href":"https:\/\/mereja.media\/index\/wp-json\/wp\/v2\/media?parent=251481"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mereja.media\/index\/wp-json\/wp\/v2\/categories?post=251481"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mereja.media\/index\/wp-json\/wp\/v2\/tags?post=251481"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}