{"id":346,"date":"2020-10-22T12:30:23","date_gmt":"2020-10-22T12:30:23","guid":{"rendered":"https:\/\/maritimesa.org\/nautical-science-grade-11\/?p=346"},"modified":"2020-10-22T12:30:23","modified_gmt":"2020-10-22T12:30:23","slug":"finding-the-latitude","status":"publish","type":"post","link":"https:\/\/maritimesa.org\/nautical-science-grade-11\/2020\/10\/22\/finding-the-latitude\/","title":{"rendered":"Finding the latitude"},"content":{"rendered":"<p>When the sun and the observer\u2019s zenith are on the same celestial meridian, then there is a simple relationship between declination, zenith distance and the latitude.\u00a0 All three are arcs of the same great circle and their values give the distance of each point from the celestial equator (equinoctial) and the distance of one from the other, the units of distance being one minute of arc of the great circle or one nautical mile.<\/p>\n<p>In the drawing below three different declinations of the sun are plotted.\u00a0 They are represented by X1, X2 and X3.\u00a0 X1 has the same name as the latitude of the observer but is greater in magnitude than the latitude.\u00a0 X2 also has the same name as the latitude but is less in magnitude than the latitude.\u00a0 X3 has the opposite name to that of the latitude.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-94\" src=\"https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-content\/uploads\/sites\/6\/2020\/10\/11.1.6.3_fig_1.jpg\" alt=\"\" width=\"900\" height=\"720\" srcset=\"https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-content\/uploads\/sites\/6\/2020\/10\/11.1.6.3_fig_1.jpg 900w, https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-content\/uploads\/sites\/6\/2020\/10\/11.1.6.3_fig_1-300x240.jpg 300w, https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-content\/uploads\/sites\/6\/2020\/10\/11.1.6.3_fig_1-768x614.jpg 768w, https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-content\/uploads\/sites\/6\/2020\/10\/11.1.6.3_fig_1-183x146.jpg 183w, https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-content\/uploads\/sites\/6\/2020\/10\/11.1.6.3_fig_1-50x40.jpg 50w, https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-content\/uploads\/sites\/6\/2020\/10\/11.1.6.3_fig_1-94x75.jpg 94w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/p>\n<p>If the declination has the same name as the latitude but is greater in magnitude, then the latitude is equal to the declination minus the zenith distance.<\/p>\n<p>If the declination has the same name as the latitude but is less in magnitude, then the latitude is equal to the declination plus the zenith distance.<\/p>\n<p>If the declination has the opposite name to the latitude, then the latitude is equal to zenith distance minus the declination.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>When the sun and the observer\u2019s zenith are on the same celestial meridian, then there is a simple relationship between declination, zenith distance and the latitude.\u00a0 All three are arcs of the same great circle and their values give the distance of each point from the celestial equator (equinoctial) and [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,54,57],"tags":[],"class_list":["post-346","post","type-post","status-publish","format-standard","hentry","category-11-1-navigation","category-11-1-6-determination-of-latitude-at-noon","category-11-1-6-3-finding-the-latitude"],"_links":{"self":[{"href":"https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-json\/wp\/v2\/posts\/346"}],"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=346"}],"version-history":[{"count":1,"href":"https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-json\/wp\/v2\/posts\/346\/revisions"}],"predecessor-version":[{"id":347,"href":"https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-json\/wp\/v2\/posts\/346\/revisions\/347"}],"wp:attachment":[{"href":"https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-json\/wp\/v2\/media?parent=346"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-json\/wp\/v2\/categories?post=346"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/maritimesa.org\/nautical-science-grade-11\/wp-json\/wp\/v2\/tags?post=346"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}