{"id":467297,"date":"2018-04-25T06:00:00","date_gmt":"2018-04-25T10:00:00","guid":{"rendered":"http:\/\/spaceweekly.com\/?guid=1c1b99b08dc96568b5fa4d87d6a1c41b"},"modified":"2018-04-25T06:00:00","modified_gmt":"2018-04-25T10:00:00","slug":"parallax-and-proper-motion","status":"publish","type":"post","link":"https:\/\/spaceweekly.com\/?p=467297","title":{"rendered":"Parallax and proper motion"},"content":{"rendered":"<p>\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/videos\/2018\/04\/parallax_and_proper_motion\/17474407-1-eng-GB\/Parallax_and_proper_motion_small.jpg\" width=\"170\" height=\"96\" align=\"left\" hspace=\"8\" \/><\/p>\n<p>\nSimulated motion of a star in the sky caused by the combination of parallax, an apparent shift caused by Earth\u2019s yearly motion around the Sun, and proper motion, which results from the star\u2019s true motion through the Galaxy. Parallax and proper motion have been exaggerated by 10 000 times to make it visible in this animation, which shows the star\u2019s position in the sky for about three and a half years.\n<\/p>\n<p>\nAstronomers need accurate measurements over more than one year to separate the parallax from the stars\u2019 true movements.&nbsp;\n<\/p>\n<p>\nESA\u2019s Gaia satellite has observed more than one billion stars, measuring their positions, parallaxes and motions across the sky to unprecedented accuracy.<\/p>\n","protected":false},"excerpt":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/videos\/2018\/04\/parallax_and_proper_motion\/17474407-1-eng-GB\/Parallax_and_proper_motion_small.jpg\" width=\"170\" height=\"96\" align=\"left\" hspace=\"8\"><\/p>\n<p>\nSimulated motion of a star in the sky caused by the combination of parallax, an apparent shift caused by Earth&rsquo;s yearly motion around the Sun, and proper motion, which results from the star&rsquo;s true motion through the Galaxy. Parallax and proper motion have been exaggerated by 10 000 times to make it visible in this animation, which shows the star&rsquo;s position in the sky for about three and a half years.\n<\/p>\n<p>\nAstronomers need accurate measurements over more than one year to separate the parallax from the stars&rsquo; true movements.&nbsp;\n<\/p>\n<p>\nESA&rsquo;s Gaia satellite has observed more than one billion stars, measuring their positions, parallaxes and motions across the sky to unprecedented accuracy.<\/p>\n","protected":false},"author":5,"featured_media":615444,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[27],"tags":[],"class_list":["post-467297","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-multimedia"],"_links":{"self":[{"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/posts\/467297","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=467297"}],"version-history":[{"count":3,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/posts\/467297\/revisions"}],"predecessor-version":[{"id":472458,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/posts\/467297\/revisions\/472458"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/media\/615444"}],"wp:attachment":[{"href":"https:\/\/spaceweekly.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=467297"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=467297"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=467297"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}