{"id":338,"date":"2020-10-22T11:52:39","date_gmt":"2020-10-22T11:52:39","guid":{"rendered":"https:\/\/maritimesa.org\/nautical-science-grade-11\/?p=338"},"modified":"2021-01-07T08:09:42","modified_gmt":"2021-01-07T08:09:42","slug":"parallax","status":"publish","type":"post","link":"https:\/\/maritimesa.org\/nautical-science-grade-11\/2020\/10\/22\/parallax\/","title":{"rendered":"Parallax"},"content":{"rendered":"<p>The last correction to be applied is parallax.\u00a0 So far the observer has been able to find the heavenly body\u2019s centre above the horizontal plane.\u00a0 All that is left is to allow for the earth\u2019s radius.\u00a0 In the drawing parallax is the angle OXC.\u00a0 As you can see the true altitude (angle XCR) is equal to the sum of the apparent altitude (angle XOH) and parallax (angle CXO).<\/p>\n<div id=\"attachment_577\" style=\"width: 910px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-577\" src=\"https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-content\/uploads\/sites\/6\/2021\/01\/11.1.5.10_fig_1_r.jpg\" alt=\"\" width=\"900\" height=\"720\" class=\"size-full wp-image-577\" srcset=\"https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-content\/uploads\/sites\/6\/2021\/01\/11.1.5.10_fig_1_r.jpg 900w, https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-content\/uploads\/sites\/6\/2021\/01\/11.1.5.10_fig_1_r-300x240.jpg 300w, https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-content\/uploads\/sites\/6\/2021\/01\/11.1.5.10_fig_1_r-768x614.jpg 768w, https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-content\/uploads\/sites\/6\/2021\/01\/11.1.5.10_fig_1_r-183x146.jpg 183w, https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-content\/uploads\/sites\/6\/2021\/01\/11.1.5.10_fig_1_r-50x40.jpg 50w, https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-content\/uploads\/sites\/6\/2021\/01\/11.1.5.10_fig_1_r-94x75.jpg 94w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><p id=\"caption-attachment-577\" class=\"wp-caption-text\">Correction for parallax.<\/p><\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The last correction to be applied is parallax.\u00a0 So far the observer has been able to find the heavenly body\u2019s centre above the horizontal plane.\u00a0 All that is left is to allow for the earth\u2019s radius.\u00a0 In the drawing parallax is the angle OXC.\u00a0 As you can see the true [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,41,51],"tags":[],"class_list":["post-338","post","type-post","status-publish","format-standard","hentry","category-11-1-navigation","category-11-1-5-altitude-correction","category-11-1-5-10-parallax"],"_links":{"self":[{"href":"https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-json\/wp\/v2\/posts\/338"}],"collection":[{"href":"https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-json\/wp\/v2\/comments?post=338"}],"version-history":[{"count":2,"href":"https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-json\/wp\/v2\/posts\/338\/revisions"}],"predecessor-version":[{"id":585,"href":"https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-json\/wp\/v2\/posts\/338\/revisions\/585"}],"wp:attachment":[{"href":"https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-json\/wp\/v2\/media?parent=338"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-json\/wp\/v2\/categories?post=338"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-json\/wp\/v2\/tags?post=338"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}