{"id":44491,"date":"2023-05-09T09:22:24","date_gmt":"2023-05-09T09:22:24","guid":{"rendered":"https:\/\/www.skyatnightmagazine.com\/?p=118514"},"modified":"2023-05-09T10:32:31","modified_gmt":"2023-05-09T10:32:31","slug":"5-ways-we-can-prove-earth-is-round-not-flat","status":"publish","type":"rss_feed","link":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/rss_feed\/5-ways-we-can-prove-earth-is-round-not-flat\/","title":{"rendered":"5 ways we can prove Earth is round, not flat"},"content":{"rendered":"<p class=\"rssexcerpt\"> Astronomers have known that Earth is a globe for thousands of years, and there are tested methods to prove this is the case. <\/p><p class=\"rssauthor\">By Ezzy Pearson\n                \t\t<\/p><p class=\"rssbyline\">Published: Tuesday, 09 May 2023 at 12:00 am<\/p><hr class=\"no-tts wp-block-separator\"\/><?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>\n<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.0 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/REC-html40\/loose.dtd\">\n<html><body> <p class=\"&quot;p1&quot;\"><span class=\"&quot;s1&quot;\">I<\/span>t\u2019s a common line to hear: \u201c500 years ago, they thought that Earth was flat!\u201d But it\u2019s also completely untrue.<\/p>\n<p class=\"&quot;p1&quot;\">Astronomers have been able to prove our planet is a globe for well over 2,000 years, using methods you can recreate at home.<\/p>\n<p class=\"&quot;p3&quot;\">The first known reference to a round Earth is in ancient Indian religious texts.<\/p>\n<ul><li><a href=\"&quot;https:\/\/www.skyatnightmagazine.com\/space-missions\/apollo-moon-landing-conspiracy-theories-crushed\/&quot;\"><em><strong>Apollo moonlanding conspiracy theories debunked<\/strong><\/em><\/a><\/li>\n<li><a href=\"&quot;https:\/\/www.skyatnightmagazine.com\/space-science\/things-mistaken-for-ufos\/&quot;\"><em><strong>Things commonly mistaken for UFOs<\/strong><\/em><\/a><\/li>\n<\/ul><div class=\"&quot;image-handler__container\" image-handler__container--full=\"\" style=\"&quot;padding-bottom:\" calc=\"\"> <picture><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2022\/11\/Japanese-Lantern-Moon-Cropped-1ae672a-e1667988497839.jpg?webp=true&amp;quality=90&amp;resize=300%2C234,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2022\/11\/Japanese-Lantern-Moon-Cropped-1ae672a-e1667988497839.jpg?quality=90&amp;resize=300%2C234,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2022\/11\/Japanese-Lantern-Moon-Cropped-1ae672a-e1667988497839.jpg?webp=true&amp;quality=90&amp;resize=355%2C277,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2022\/11\/Japanese-Lantern-Moon-Cropped-1ae672a-e1667988497839.jpg?quality=90&amp;resize=355%2C277,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2022\/11\/Japanese-Lantern-Moon-Cropped-1ae672a-e1667988497839.jpg?webp=true&amp;quality=90&amp;resize=405%2C316,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2022\/11\/Japanese-Lantern-Moon-Cropped-1ae672a-e1667988497839.jpg?quality=90&amp;resize=405%2C316,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2022\/11\/Japanese-Lantern-Moon-Cropped-1ae672a-e1667988497839.jpg?webp=true&amp;quality=90&amp;resize=554%2C433,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2022\/11\/Japanese-Lantern-Moon-Cropped-1ae672a-e1667988497839.jpg?quality=90&amp;resize=554%2C433,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2022\/11\/Japanese-Lantern-Moon-Cropped-1ae672a-e1667988497839.jpg?webp=true&amp;quality=90&amp;resize=620%2C484&quot;\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2022\/11\/Japanese-Lantern-Moon-Cropped-1ae672a-e1667988497839.jpg?quality=90&amp;resize=620%2C484&quot;\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2022\/11\/Japanese-Lantern-Moon-Cropped-1ae672a-e1667988497839.jpg?webp=true&amp;quality=90&amp;resize=408%2C319,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2022\/11\/Japanese-Lantern-Moon-Cropped-1ae672a-e1667988497839.jpg?quality=90&amp;resize=408%2C319,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2022\/11\/Japanese-Lantern-Moon-Cropped-1ae672a-e1667988497839.jpg?webp=true&amp;quality=90&amp;resize=556%2C434,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2022\/11\/Japanese-Lantern-Moon-Cropped-1ae672a-e1667988497839.jpg?quality=90&amp;resize=556%2C434,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><img class=\"&quot;wp-image-113468\" align=\"\" size-full=\"\" image-handler__image=\"\" image-handler__image--full=\"\" no-wrap=\"\" js-lazyload=\"\" data-src=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2022\/11\/Japanese-Lantern-Moon-Cropped-1ae672a-e1667988497839.jpg?quality=90&amp;resize=620%2C484&quot;\" width=\"&quot;1200&quot;\" height=\"&quot;937&quot;\" alt=\"&quot;&quot;\" title=\"&quot;&quot;\"\/><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/picture><\/div><div class=\"&quot;caption-hold&quot;\"><figcaption class=\"&quot;wp-caption-text&quot;\"><span class=\"&quot;caption-copy&quot;\"><i class=\"&quot;icon-arrow\" icon-camera-circle=\"\"\/> The total lunar eclipse of 8 November 2022 captured by Soumyadeep Mukherjee, Kolkata, India. During a lunar eclipse, we can see Earth\u2019s shadow is round.<\/span><\/figcaption><span class=\"&quot;im-image-caption&quot;\"\/><\/div>\n<p class=\"&quot;p3&quot;\">The Rigveda, first composed between 1500 and 1000 BCE, includes the verse \u2018In the midst of the Universe, the spherical Earth stays\u2019.<\/p>\n<p class=\"&quot;p3&quot;\">Unfortunately, though there is much evidence of ancient India\u2019s extremely advanced knowledge of astronomy, there is little surviving record of their methods.<\/p>\n<p class=\"&quot;p3&quot;\">For that, we must turn to the Greek \u2018natural philosophers\u2019.<\/p>\n<h3><strong>Observe Earth\u2019s shadow during a lunar eclipse<\/strong><\/h3>\n<div class=\"&quot;image-handler__container\" image-handler__container--full=\"\" style=\"&quot;padding-bottom:\" calc=\"\"> <picture><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/lunar-eclipse-round-earth-a08cbe2.jpg?webp=true&amp;quality=90&amp;resize=300%2C233,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/lunar-eclipse-round-earth-a08cbe2.jpg?quality=90&amp;resize=300%2C233,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/lunar-eclipse-round-earth-a08cbe2.jpg?webp=true&amp;quality=90&amp;resize=355%2C276,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/lunar-eclipse-round-earth-a08cbe2.jpg?quality=90&amp;resize=355%2C276,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/lunar-eclipse-round-earth-a08cbe2.jpg?webp=true&amp;quality=90&amp;resize=405%2C315,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/lunar-eclipse-round-earth-a08cbe2.jpg?quality=90&amp;resize=405%2C315,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/lunar-eclipse-round-earth-a08cbe2.jpg?webp=true&amp;quality=90&amp;resize=554%2C430,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/lunar-eclipse-round-earth-a08cbe2.jpg?quality=90&amp;resize=554%2C430,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/lunar-eclipse-round-earth-a08cbe2.jpg?webp=true&amp;quality=90&amp;resize=620%2C482&quot;\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/lunar-eclipse-round-earth-a08cbe2.jpg?quality=90&amp;resize=620%2C482&quot;\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/lunar-eclipse-round-earth-a08cbe2.jpg?webp=true&amp;quality=90&amp;resize=408%2C317,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/lunar-eclipse-round-earth-a08cbe2.jpg?quality=90&amp;resize=408%2C317,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/lunar-eclipse-round-earth-a08cbe2.jpg?webp=true&amp;quality=90&amp;resize=556%2C432,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/lunar-eclipse-round-earth-a08cbe2.jpg?quality=90&amp;resize=556%2C432,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><img class=\"&quot;wp-image-118521\" align=\"\" size-full=\"\" image-handler__image=\"\" image-handler__image--full=\"\" no-wrap=\"\" js-lazyload=\"\" data-src=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/lunar-eclipse-round-earth-a08cbe2.jpg?quality=90&amp;resize=620%2C482&quot;\" width=\"&quot;1200&quot;\" height=\"&quot;932&quot;\" alt=\"&quot;&quot;\" title=\"&quot;&quot;\"\/><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/picture><\/div><div class=\"&quot;caption-hold&quot;\"><figcaption class=\"&quot;wp-caption-text&quot;\"><span class=\"&quot;caption-copy&quot;\"><i class=\"&quot;icon-arrow\" icon-camera-circle=\"\"\/> During an eclipse, Earth casts a circular shadow on the Moon, not an oval \u2013 something astronomers in the 5th century BCE knew suggested a spherical world<\/span><\/figcaption><span class=\"&quot;im-image-caption&quot;\"\/><\/div>\n<p class=\"&quot;p3&quot;\">The first written evidence that Earth was a globe comes from Empedocles and Anaxagoras in around 430 BCE, both of whom noticed Earth\u2019s shadow appeared rounded during a <a href=\"&quot;https:\/\/www.skyatnightmagazine.com\/astrophotography\/moon\/lunar-eclipses\/&quot;\">lunar eclipse<\/a>.<\/p>\n<p class=\"&quot;p3&quot;\">You can look out for its curve yourself during the <a href=\"&quot;https:\/\/www.skyatnightmagazine.com\/advice\/solar-lunar-eclipse-guide-when-where\/&quot;\">next eclipse<\/a>.<\/p>\n<h3><strong>Observe ships on the horizon<\/strong><\/h3>\n<div class=\"&quot;image-handler__container\" image-handler__container--full=\"\" style=\"&quot;padding-bottom:\" calc=\"\"> <picture><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/curved-earth-ship-horizon-78630a6.jpg?webp=true&amp;quality=90&amp;resize=300%2C104,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/curved-earth-ship-horizon-78630a6.jpg?quality=90&amp;resize=300%2C104,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/curved-earth-ship-horizon-78630a6.jpg?webp=true&amp;quality=90&amp;resize=355%2C123,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/curved-earth-ship-horizon-78630a6.jpg?quality=90&amp;resize=355%2C123,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/curved-earth-ship-horizon-78630a6.jpg?webp=true&amp;quality=90&amp;resize=405%2C141,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/curved-earth-ship-horizon-78630a6.jpg?quality=90&amp;resize=405%2C141,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/curved-earth-ship-horizon-78630a6.jpg?webp=true&amp;quality=90&amp;resize=554%2C192&quot;\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/curved-earth-ship-horizon-78630a6.jpg?quality=90&amp;resize=554%2C192&quot;\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/curved-earth-ship-horizon-78630a6.jpg?webp=true&amp;quality=90&amp;resize=620%2C215&quot;\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/curved-earth-ship-horizon-78630a6.jpg?quality=90&amp;resize=620%2C215&quot;\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/curved-earth-ship-horizon-78630a6.jpg?webp=true&amp;quality=90&amp;resize=408%2C142,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/curved-earth-ship-horizon-78630a6.jpg?quality=90&amp;resize=408%2C142,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/curved-earth-ship-horizon-78630a6.jpg?webp=true&amp;quality=90&amp;resize=556%2C193&quot;\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/curved-earth-ship-horizon-78630a6.jpg?quality=90&amp;resize=556%2C193&quot;\" type=\"&quot;image\/jpeg&quot;\"><img class=\"&quot;wp-image-118518\" align=\"\" size-full=\"\" image-handler__image=\"\" image-handler__image--full=\"\" no-wrap=\"\" js-lazyload=\"\" data-src=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/curved-earth-ship-horizon-78630a6.jpg?quality=90&amp;resize=620%2C215&quot;\" width=\"&quot;1000&quot;\" height=\"&quot;347&quot;\" alt=\"&quot;&quot;\" title=\"&quot;&quot;\"\/><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/picture><\/div><div class=\"&quot;caption-hold&quot;\"><figcaption class=\"&quot;wp-caption-text&quot;\"><span class=\"&quot;caption-copy&quot;\"><i class=\"&quot;icon-arrow\" icon-camera-circle=\"\"\/> Way back in 350 BCE, Aristotle saw evidence for the curve in the disappearing hulls of ships as they sailed away.<\/span><\/figcaption><span class=\"&quot;im-image-caption&quot;\"\/><\/div>\n<p class=\"&quot;p3&quot;\">In 350 BCE, Aristotle added even more evidence.<\/p>\n<p class=\"&quot;p3&quot;\">He noted that when a ship sailed beyond the horizon, the masts would remain visible after the hull had disappeared, as you would expect if it had sailed around a curved edge.<\/p>\n<p class=\"&quot;p3&quot;\">If you\u2019re near a port you can do the same with modern ships, though you\u2019ll need to look for their upper decks, rather than sails.<\/p>\n<h3><strong>Note the North Star\u2019s changing position<\/strong><\/h3>\n<div class=\"&quot;image-handler__container\" image-handler__container--full=\"\" style=\"&quot;padding-bottom:\" calc=\"\"> <picture><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/round-earth-pole-star-a6c47af.jpg?webp=true&amp;quality=90&amp;resize=300%2C297,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/round-earth-pole-star-a6c47af.jpg?quality=90&amp;resize=300%2C297,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/round-earth-pole-star-a6c47af.jpg?webp=true&amp;quality=90&amp;resize=355%2C351,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/round-earth-pole-star-a6c47af.jpg?quality=90&amp;resize=355%2C351,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/round-earth-pole-star-a6c47af.jpg?webp=true&amp;quality=90&amp;resize=405%2C401,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/round-earth-pole-star-a6c47af.jpg?quality=90&amp;resize=405%2C401,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/round-earth-pole-star-a6c47af.jpg?webp=true&amp;quality=90&amp;resize=554%2C548&quot;\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/round-earth-pole-star-a6c47af.jpg?quality=90&amp;resize=554%2C548&quot;\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/round-earth-pole-star-a6c47af.jpg?webp=true&amp;quality=90&amp;resize=620%2C614&quot;\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/round-earth-pole-star-a6c47af.jpg?quality=90&amp;resize=620%2C614&quot;\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/round-earth-pole-star-a6c47af.jpg?webp=true&amp;quality=90&amp;resize=408%2C404,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/round-earth-pole-star-a6c47af.jpg?quality=90&amp;resize=408%2C404,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/round-earth-pole-star-a6c47af.jpg?webp=true&amp;quality=90&amp;resize=556%2C550&quot;\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/round-earth-pole-star-a6c47af.jpg?quality=90&amp;resize=556%2C550&quot;\" type=\"&quot;image\/jpeg&quot;\"><img class=\"&quot;wp-image-118520\" align=\"\" size-full=\"\" image-handler__image=\"\" image-handler__image--full=\"\" no-wrap=\"\" js-lazyload=\"\" data-src=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/round-earth-pole-star-a6c47af.jpg?quality=90&amp;resize=620%2C614&quot;\" width=\"&quot;1000&quot;\" height=\"&quot;990&quot;\" alt=\"&quot;&quot;\" title=\"&quot;&quot;\"\/><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/picture><\/div><div class=\"&quot;caption-hold&quot;\"><figcaption class=\"&quot;wp-caption-text&quot;\"><span class=\"&quot;caption-copy&quot;\"><i class=\"&quot;icon-arrow\" icon-camera-circle=\"\"\/> To northern observers the Pole Star is higher in the sky \u2013 more proof of Earth\u2019s non-flatness.<\/span><\/figcaption><span class=\"&quot;im-image-caption&quot;\"\/><\/div>\n<p class=\"&quot;p3&quot;\">At the time, it was well known that different constellations appeared in different places \u2013 for example, the <a href=\"&quot;https:\/\/www.skyatnightmagazine.com\/advice\/skills\/how-find-polaris-north-star\/&quot;\">North Star<\/a> is closer to the horizon in Cairo than it is in Athens.<\/p>\n<p class=\"&quot;p3&quot;\">However, Aristotle was the first to suggest that because Egypt is further south, it would be looking at the star from a shallower angle if the world was a globe.<\/p>\n<p class=\"&quot;p3&quot;\">Next time you take a holiday within the Northern Hemisphere, keep an eye out for the North Star and see how its position compares to back home.<\/p>\n<h3><strong>Measure the length of shadows<\/strong><\/h3>\n<div class=\"&quot;image-handler__container\" image-handler__container--full=\"\" style=\"&quot;padding-bottom:\" calc=\"\"> <picture><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/03\/GettyImages-1286495957-1-2d1cca3-e1678890007514.jpg?webp=true&amp;quality=90&amp;resize=300%2C200,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/03\/GettyImages-1286495957-1-2d1cca3-e1678890007514.jpg?quality=90&amp;resize=300%2C200,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/03\/GettyImages-1286495957-1-2d1cca3-e1678890007514.jpg?webp=true&amp;quality=90&amp;resize=355%2C237,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/03\/GettyImages-1286495957-1-2d1cca3-e1678890007514.jpg?quality=90&amp;resize=355%2C237,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/03\/GettyImages-1286495957-1-2d1cca3-e1678890007514.jpg?webp=true&amp;quality=90&amp;resize=405%2C270,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/03\/GettyImages-1286495957-1-2d1cca3-e1678890007514.jpg?quality=90&amp;resize=405%2C270,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/03\/GettyImages-1286495957-1-2d1cca3-e1678890007514.jpg?webp=true&amp;quality=90&amp;resize=554%2C369,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/03\/GettyImages-1286495957-1-2d1cca3-e1678890007514.jpg?quality=90&amp;resize=554%2C369,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/03\/GettyImages-1286495957-1-2d1cca3-e1678890007514.jpg?webp=true&amp;quality=90&amp;resize=620%2C413&quot;\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/03\/GettyImages-1286495957-1-2d1cca3-e1678890007514.jpg?quality=90&amp;resize=620%2C413&quot;\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/03\/GettyImages-1286495957-1-2d1cca3-e1678890007514.jpg?webp=true&amp;quality=90&amp;resize=408%2C272,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/03\/GettyImages-1286495957-1-2d1cca3-e1678890007514.jpg?quality=90&amp;resize=408%2C272,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/03\/GettyImages-1286495957-1-2d1cca3-e1678890007514.jpg?webp=true&amp;quality=90&amp;resize=556%2C371,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/03\/GettyImages-1286495957-1-2d1cca3-e1678890007514.jpg?quality=90&amp;resize=556%2C371,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><img class=\"&quot;wp-image-117106\" align=\"\" size-full=\"\" image-handler__image=\"\" image-handler__image--full=\"\" no-wrap=\"\" js-lazyload=\"\" data-src=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/03\/GettyImages-1286495957-1-2d1cca3-e1678890007514.jpg?quality=90&amp;resize=620%2C413&quot;\" width=\"&quot;1200&quot;\" height=\"&quot;800&quot;\" alt=\"&quot;&quot;\" title=\"&quot;&quot;\"\/><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/picture><\/div><div class=\"&quot;caption-hold&quot;\"><figcaption class=\"&quot;wp-caption-text&quot;\"><span class=\"&quot;caption-copy&quot;\"><i class=\"&quot;icon-arrow\" icon-camera-circle=\"\"\/> Credit: Shunli Zhao \/ Getty Images<\/span><\/figcaption><span class=\"&quot;im-image-caption&quot;\"\/><\/div>\n<p class=\"&quot;p3&quot;\">The Greeks also noted the same effect caused the lengths of shadows to differ, depending on how far north or south you were.<\/p>\n<p class=\"&quot;p3&quot;\">Several scientists used this to measure the circumference of Earth, but the earliest recorded account is from around 240 BCE.<\/p>\n<p class=\"&quot;p3&quot;\">Eratosthenes, from the town of Cyrene (Aswan in modern-day Libya) knew there was a well in Cyrene where, at noon on a certain day of the year, the Sun would perfectly illuminate the water but not the well walls, showing the Sun was directly overhead.<\/p>\n<p class=\"&quot;p3&quot;\">Later, he worked at the Library of Alexandria in Egypt, located hundreds of kilometres to the north.<\/p>\n<p class=\"&quot;p3&quot;\">On the same day of the year, he erected a pole and used the length of the shadow to measure the angle of the Sun as 7.2\u00b0, around 1\/50th of a complete circle.<\/p>\n<p class=\"&quot;p3&quot;\">This meant the distance between the two cities was 1\/50th of Earth\u2019s circumference.<\/p>\n<p class=\"&quot;p3&quot;\">Fortunately, the distance had already been well measured, so he knew they were 5,000 stadia apart.<\/p>\n<p class=\"&quot;p3&quot;\">The exact length of a stadia varied in the ancient world, but this puts Erastothenes\u2019s measurement between 38,000 and 46,000km \u2013 not far from the current measured circumference around the poles of 40,008km.<\/p>\n<h3><strong>Circumnavigate the globe<\/strong><\/h3>\n<div class=\"&quot;image-handler__container\" image-handler__container--full=\"\" style=\"&quot;padding-bottom:\" calc=\"\"> <picture><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/GettyImages-115245362-10d9295-e1683626117760.jpg?webp=true&amp;quality=90&amp;resize=300%2C199,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/GettyImages-115245362-10d9295-e1683626117760.jpg?quality=90&amp;resize=300%2C199,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/GettyImages-115245362-10d9295-e1683626117760.jpg?webp=true&amp;quality=90&amp;resize=355%2C236,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/GettyImages-115245362-10d9295-e1683626117760.jpg?quality=90&amp;resize=355%2C236,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/GettyImages-115245362-10d9295-e1683626117760.jpg?webp=true&amp;quality=90&amp;resize=405%2C269,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/GettyImages-115245362-10d9295-e1683626117760.jpg?quality=90&amp;resize=405%2C269,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/GettyImages-115245362-10d9295-e1683626117760.jpg?webp=true&amp;quality=90&amp;resize=554%2C368,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(max-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/GettyImages-115245362-10d9295-e1683626117760.jpg?quality=90&amp;resize=554%2C368,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/GettyImages-115245362-10d9295-e1683626117760.jpg?webp=true&amp;quality=90&amp;resize=620%2C412&quot;\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/GettyImages-115245362-10d9295-e1683626117760.jpg?quality=90&amp;resize=620%2C412&quot;\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/GettyImages-115245362-10d9295-e1683626117760.jpg?webp=true&amp;quality=90&amp;resize=408%2C271,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/GettyImages-115245362-10d9295-e1683626117760.jpg?quality=90&amp;resize=408%2C271,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/GettyImages-115245362-10d9295-e1683626117760.jpg?webp=true&amp;quality=90&amp;resize=556%2C369,\" https:=\"\" type=\"&quot;image\/webp&quot;\"><source media=\"&quot;(min-width:\" data-srcset=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/GettyImages-115245362-10d9295-e1683626117760.jpg?quality=90&amp;resize=556%2C369,\" https:=\"\" type=\"&quot;image\/jpeg&quot;\"><img class=\"&quot;wp-image-118522\" align=\"\" size-full=\"\" image-handler__image=\"\" image-handler__image--full=\"\" no-wrap=\"\" js-lazyload=\"\" data-src=\"&quot;https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2023\/05\/GettyImages-115245362-10d9295-e1683626117760.jpg?quality=90&amp;resize=620%2C412&quot;\" width=\"&quot;1200&quot;\" height=\"&quot;797&quot;\" alt=\"&quot;&quot;\" title=\"&quot;&quot;\"\/><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/picture><\/div><div class=\"&quot;caption-hold&quot;\"><figcaption class=\"&quot;wp-caption-text&quot;\"><span class=\"&quot;caption-copy&quot;\"><i class=\"&quot;icon-arrow\" icon-camera-circle=\"\"\/> Credit: Howard Oates \/ Getty Images<\/span><\/figcaption><span class=\"&quot;im-image-caption&quot;\"\/><\/div>\n<p class=\"&quot;p3&quot;\"><span class=\"&quot;s3&quot;\">Over the following centuries, knowledge of a globe-shaped Earth spread through the astronomers of Europe, India and the Arab world.<\/span><\/p>\n<p class=\"&quot;p3&quot;\"><span class=\"&quot;s3&quot;\">However, the first direct proof that Earth was a spherical globe was in 1519, when the Magellan\u2013Elanco expedition first circumnavigated the globe.<\/span><\/p>\n<p class=\"&quot;p3&quot;\"><span class=\"&quot;s3&quot;\">Though unless you are both extremely wealthy and an expert sailor, you might have trouble replicating that one at home.<\/span><\/p>\n<p><em><strong>This guide originally appeared in the May 2023 issue of <\/strong><\/em><strong>BBC Sky at Night Magazine<\/strong><em><strong>.<\/strong><\/em><\/p> <\/body><\/html>\n<hr class=\"no-tts wp-block-separator\"\/>","protected":false},"excerpt":{"rendered":"<p> Astronomers have known that Earth is a globe for thousands of years, and there are tested methods to prove this is the case. <\/p>\n","protected":false},"author":24,"featured_media":44492,"template":"","categories":[1],"acf":{"readingTimeMinutes":"4"},"uagb_featured_image_src":{"full":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2023\/05\/5-ways-we-can-prove-earth-is-round-not-flat.jpg",1200,799,false],"thumbnail":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2023\/05\/5-ways-we-can-prove-earth-is-round-not-flat-150x150.jpg",150,150,true],"medium":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2023\/05\/5-ways-we-can-prove-earth-is-round-not-flat-300x200.jpg",300,200,true],"medium_large":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2023\/05\/5-ways-we-can-prove-earth-is-round-not-flat-768x511.jpg",768,511,true],"large":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2023\/05\/5-ways-we-can-prove-earth-is-round-not-flat-1024x682.jpg",800,533,true],"1536x1536":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2023\/05\/5-ways-we-can-prove-earth-is-round-not-flat.jpg",1200,799,false],"2048x2048":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2023\/05\/5-ways-we-can-prove-earth-is-round-not-flat.jpg",1200,799,false]},"uagb_author_info":{"display_name":"importmanagerhub@sprylab.com","author_link":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/author\/importmanagerhubsprylab-com\/"},"uagb_comment_info":0,"uagb_excerpt":"Astronomers have known that Earth is a globe for thousands of years, and there are tested methods to prove this is the case.","_links":{"self":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/rss_feed\/44491"}],"collection":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/rss_feed"}],"about":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/types\/rss_feed"}],"author":[{"embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/users\/24"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/media\/44492"}],"wp:attachment":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/media?parent=44491"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/categories?post=44491"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}