{"id":9325,"date":"2024-08-25T16:54:13","date_gmt":"2024-08-25T08:54:13","guid":{"rendered":"https:\/\/tommykwan.com\/blog\/?p=9325"},"modified":"2024-08-25T17:30:17","modified_gmt":"2024-08-25T09:30:17","slug":"nav-the-earth-radius-and-circumference-%e5%9c%b0%e7%90%83%e5%8d%8a%e5%be%91%e5%8f%8a%e5%9c%b0%e7%90%83%e5%9c%93%e5%91%a8","status":"publish","type":"post","link":"https:\/\/tommykwan.com\/blog\/aviation\/nav-the-earth-radius-and-circumference-%e5%9c%b0%e7%90%83%e5%8d%8a%e5%be%91%e5%8f%8a%e5%9c%b0%e7%90%83%e5%9c%93%e5%91%a8\/","title":{"rendered":"[NAV] The earth radius and circumference \u5730\u7403\u534a\u5f91\u53ca\u5730\u7403\u5713\u5468"},"content":{"rendered":"<p>Equatorial radius (major semi axis) of the earth is 6378 km while Polar radius (minor semi axis) of the earth is 6357, and so<\/p>\n<ul>\n<li>Equatorial circumference is around 2 x 3.14 x 6378 = 40054 &#8211; i.e approx 40,000 km (21,600 NM)<\/li>\n<li>Geographic pole-to-pole circumference is around 2 x 3.14 x 6357 = 39922 (21,556 NM)<\/li>\n<\/ul>\n<p>The earth is not round, but pear-shaped. In short, the<span style=\"color: #ff0000;\"> radius of the earth is around 63XX km<\/span> and the <span style=\"color: #ff0000;\">circumference of the earth is around\u00a0 40,000 km<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"https:\/\/api.letsdiskuss.com\/resources\/static\/asset\/uploads\/1703094451406-images-2023-12-20T231145.340.jpeg\" alt=\"What is the radius of the earth? - letsdiskuss\" width=\"383\" height=\"263\" \/><\/p>\n<p><em>Note: circumference (\u5713\u5468\u516c\u5f0f) = 2\u03c0r<\/em><\/p>\n<div class=\"embed-container\"><iframe loading=\"lazy\" title=\"The Earth and the Geographic Coordinates\" width=\"1170\" height=\"658\" src=\"https:\/\/www.youtube.com\/embed\/5jni8uZcyLg?start=23&#038;feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<p>Read more:<\/p>\n<ul>\n<li><a href=\"https:\/\/tommykwan.com\/blog\/aviation\/whats-solar-insolation\/\">What\u2019s Solar insolation?<\/a><\/li>\n<li><a href=\"https:\/\/tommykwan.com\/blog\/aviation\/what-is-global-circulation\/\">What is global circulation?<\/a><\/li>\n<li><a href=\"https:\/\/tommykwan.com\/blog\/aviation\/what-is-the-geographic-true-north-pole\/\">What is the Geographic (True) North Pole?<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Equatorial radius (major semi axis) of the earth is 6378 km while Polar radius (minor semi axis) of the earth is 6357, and so Equatorial circumference is around 2 x 3.14 x 6378 = 40054 &#8211; i.e approx 40,000 km (21,600 NM) Geographic pole-to-pole circumference is around 2 x 3.14 x 6357 = 39922 (21,556<a class=\"read-more \" href=\"https:\/\/tommykwan.com\/blog\/aviation\/nav-the-earth-radius-and-circumference-%e5%9c%b0%e7%90%83%e5%8d%8a%e5%be%91%e5%8f%8a%e5%9c%b0%e7%90%83%e5%9c%93%e5%91%a8\/\" title=\"Read More\"> <span class=\"button default\">Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[64,70],"tags":[],"class_list":["post-9325","post","type-post","status-publish","format-standard","hentry","category-aviation","category-navigation"],"_links":{"self":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/9325","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/comments?post=9325"}],"version-history":[{"count":11,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/9325\/revisions"}],"predecessor-version":[{"id":9338,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/9325\/revisions\/9338"}],"wp:attachment":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/media?parent=9325"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/categories?post=9325"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/tags?post=9325"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}