{"id":51116,"date":"2017-05-02T22:45:44","date_gmt":"2017-05-02T19:45:44","guid":{"rendered":"http:\/\/www.lovendal.ro\/wp52\/?p=51116"},"modified":"2017-05-02T22:45:44","modified_gmt":"2017-05-02T19:45:44","slug":"cum-grecul-eratostene-a-calculat-cu-multa-precizie-acum-2-200-de-ani-distanta-de-la-soare-la-pamant-sa-mai-zica-cineva-ca-anticii-erau-prosti","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/cum-grecul-eratostene-a-calculat-cu-multa-precizie-acum-2-200-de-ani-distanta-de-la-soare-la-pamant-sa-mai-zica-cineva-ca-anticii-erau-prosti\/","title":{"rendered":"Cum grecul Eratostene a calculat cu mult\u0103 precizie, acum 2.200 de ani, distan\u0163a de la Soare la P\u0103m\u00e2nt! S\u0103 mai zic\u0103 cineva c\u0103 anticii erau pro\u015fti&#8230;"},"content":{"rendered":"<p><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2017\/05\/eratostene.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-51117\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2017\/05\/eratostene.jpg\" alt=\"\" width=\"333\" height=\"275\" srcset=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2017\/05\/eratostene.jpg 333w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2017\/05\/eratostene-300x248.jpg 300w\" sizes=\"auto, (max-width: 333px) 100vw, 333px\" \/><\/a>\u00cen anul 240 \u00ee.H., geometrul Eratostene a calculat pentru prima dat\u0103 dimensiunea circumferin\u0163ei terestre. Eratostene \u015ftia c\u0103, la amiaza, \u00een timpul solsti\u0163iului de var\u0103, \u00een ora\u015ful Syene (actualul ora\u015f Aswan din Egipt) lumina soarelui p\u0103trunde drept p\u00e2n\u0103 \u00een fundul f\u00e2nt\u00e2nilor. \u015etia de asemenea c\u0103 \u00een Alexandria soarele formeaz\u0103 un unghi egal cu 1\/50 dintr-un cerc (7\u00b0 12&#8242;) la sud de zenit, la aceea\u015fi or\u0103.<\/p>\n<p>Presupun\u00e2nd c\u0103 Alexandria se afla la nord de Syene, Eratostene a calculat c\u0103 distan\u0163a \u00eentre cele dou\u0103 ora\u015fe era 1\/50 din circumferin\u0163a P\u0103m\u00e2ntului. Distan\u0163a estimat\u0103 de el \u00eentre cele dou\u0103 ora\u015fe era de 5000 de stadii. Rotunjind rezultatul la 700 de stadii pentru un grad a ajuns la 252.000 de stadii, respectiv 46620 de km, cu 16% mai mare dec\u00e2t dimensiunea real\u0103. Eroarea nu se datoreaz\u0103 calculelor, ci faptului c\u0103 Eratostene nu apreciase corect pozi\u0163ia geografic\u0103 \u015fi distan\u0163a exact\u0103 dintre cele dou\u0103 ora\u015fe.<\/p>\n<p>Eusebiu din Cesarea, \u00een <em>Praeparatio Evangelica<\/em>, afirm\u0103 c\u0103 Eratostene a calculat distan\u0163a p\u00e2n\u0103 la Soare. Pentru a exprima rezultatul lui Eratostene, Eusebiu folose\u015fte o expresie obscur\u0103: \u201e400 de miriade \u015fi 80.000 de stadia\u201d. Expresia poate fi interpretat\u0103 ca \u00eensemn\u00e2nd 804 milioane de stadia, adic\u0103 149 milioane de km. Diferen\u0163a \u00eentre aceasta \u015fi valoarea modern acceptat\u0103 este de doar 1%.<\/p>\n<p>S\u0103 mai zic\u0103 cineva c\u0103 oamenii din antichitate erau pro\u015fti&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00cen anul 240 \u00ee.H., geometrul Eratostene a calculat pentru prima dat\u0103 dimensiunea circumferin\u0163ei terestre. Eratostene \u015ftia c\u0103, la amiaza, \u00een timpul solsti\u0163iului de var\u0103, \u00een ora\u015ful Syene (actualul ora\u015f Aswan din Egipt) lumina soarelui p\u0103trunde drept p\u00e2n\u0103 \u00een fundul f\u00e2nt\u00e2nilor. &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Cum grecul Eratostene a calculat cu mult\u0103 precizie, acum 2.200 de ani, distan\u0163a de la Soare la P\u0103m\u00e2nt! S\u0103 mai zic\u0103 cineva c\u0103 anticii erau pro\u015fti&#8230;\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/cum-grecul-eratostene-a-calculat-cu-multa-precizie-acum-2-200-de-ani-distanta-de-la-soare-la-pamant-sa-mai-zica-cineva-ca-anticii-erau-prosti\/#more-51116\" aria-label=\"Cite\u0219te mai multe despre Cum grecul Eratostene a calculat cu mult\u0103 precizie, acum 2.200 de ani, distan\u0163a de la Soare la P\u0103m\u00e2nt! S\u0103 mai zic\u0103 cineva c\u0103 anticii erau pro\u015fti&#8230;\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":51117,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,2833],"tags":[386,4018,1751,1532,151,105,865],"class_list":["post-51116","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-istorie","category-noutati","tag-egipt","tag-eratostene","tag-geometrie","tag-istorie-si-civilizatii","tag-oras","tag-pamant","tag-soare","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.3 (Yoast SEO v24.2) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Cum grecul Eratostene a calculat cu mult\u0103 precizie, acum 2.200 de ani, distan\u0163a de la Soare la P\u0103m\u00e2nt! S\u0103 mai zic\u0103 cineva c\u0103 anticii erau pro\u015fti... - Secretele lui Lovendal<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.lovendal.ro\/wp52\/cum-grecul-eratostene-a-calculat-cu-multa-precizie-acum-2-200-de-ani-distanta-de-la-soare-la-pamant-sa-mai-zica-cineva-ca-anticii-erau-prosti\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cum grecul Eratostene a calculat cu mult\u0103 precizie, acum 2.200 de ani, distan\u0163a de la Soare la P\u0103m\u00e2nt! S\u0103 mai zic\u0103 cineva c\u0103 anticii erau pro\u015fti...\" \/>\n<meta property=\"og:description\" content=\"\u00cen anul 240 \u00ee.H., geometrul Eratostene a calculat pentru prima dat\u0103 dimensiunea circumferin\u0163ei terestre. Eratostene \u015ftia c\u0103, la amiaza, \u00een timpul solsti\u0163iului de var\u0103, \u00een ora\u015ful Syene (actualul ora\u015f Aswan din Egipt) lumina soarelui p\u0103trunde drept p\u00e2n\u0103 \u00een fundul f\u00e2nt\u00e2nilor. ... 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