{"id":97676,"date":"2025-04-30T18:35:39","date_gmt":"2025-04-30T15:35:39","guid":{"rendered":"https:\/\/www.lovendal.ro\/wp52\/?p=97676"},"modified":"2025-04-30T18:35:39","modified_gmt":"2025-04-30T15:35:39","slug":"impresionant-in-urma-cu-peste-2-000-de-ani-un-intelept-grec-a-calculat-aproape-exact-marimea-pamantului-folosind-doar-un-bat-si-umbra-lasata-de-soare","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/impresionant-in-urma-cu-peste-2-000-de-ani-un-intelept-grec-a-calculat-aproape-exact-marimea-pamantului-folosind-doar-un-bat-si-umbra-lasata-de-soare\/","title":{"rendered":"Impresionant! \u00cen urm\u0103 cu peste 2.000 de ani, un \u00een\u0163elept grec a calculat aproape exact m\u0103rimea P\u0103m\u00e2ntului, folosind doar un b\u0103\u0163 \u015fi umbra l\u0103sat\u0103 de Soare"},"content":{"rendered":"<p><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/04\/circumferinta-Pamantului.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft  wp-image-97677\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/04\/circumferinta-Pamantului.jpg\" alt=\"\" width=\"364\" height=\"220\" srcset=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/04\/circumferinta-Pamantului.jpg 556w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/04\/circumferinta-Pamantului-300x181.jpg 300w\" sizes=\"auto, (max-width: 364px) 100vw, 364px\" \/><\/a>\u00cen urm\u0103 cu mai bine de 2.000 de ani, un \u00een\u021belept grec care tr\u0103ia \u00een <strong>Egipt<\/strong> a f\u0103cut ceva ce sun\u0103 a SF: a calculat circumferin\u021ba P\u0103m\u00e2ntului cu mare precizie, folosindu-se doar de observa\u021bie, geometrie \u0219i un b\u0103\u021b. Numele lui era <strong>Eratostene<\/strong>. N\u0103scut \u00een <strong>Cirene<\/strong> (un ora\u0219 grecesc antic) \u00een jurul anului 276 \u00ee.Hr., Eratostene a fost un adev\u0103rat geniu al timpului s\u0103u: matematician, astronom, filosof, geograf \u0219i, de asemenea, director al celebrei Biblioteci din Alexandria, probabil cel mai mare centru de cunoa\u0219tere din lumea antic\u0103.<\/p>\n<p>Cum a f\u0103cut-o? Eratostene \u0219tia c\u0103 \u00een Syene (actualul <strong>Aswan<\/strong>, sudul Egiptului), Soarele de la amiaz\u0103, la solsti\u021biul de var\u0103, c\u0103dea direct deasupra capului: nu exista umbr\u0103, iar reflexia Soarelui ajungea la fundul f\u00e2nt\u00e2nilor. Totu\u0219i, \u00een <strong>Alexandria<\/strong>, care se afl\u0103 la nord, \u00een aceea\u0219i zi \u0219i la aceea\u0219i or\u0103, obiectele aruncau o umbr\u0103. Aceast\u0103 diferen\u021b\u0103 putea fi explicat\u0103 doar dac\u0103 suprafa\u021ba P\u0103m\u00e2ntului ar fi curbat\u0103. A\u0219adar, Eratostene a efectuat un experiment: a \u00eenfipt o tij\u0103 vertical\u0103 \u00een p\u0103m\u00e2ntul din Alexandria \u0219i, la pr\u00e2nz, \u00een timpul solsti\u021biului, a m\u0103surat unghiul umbrei proiectate. A ob\u021binut un unghi apropiat de 7,2\u00b0, ceea ce reprezint\u0103 1\/50 dintr-un cerc complet (360\u00b0). Cu aceste informa\u021bii, a f\u0103cut un calcul genial: dac\u0103 7,2\u00b0 este egal cu distan\u021ba dintre Syene \u0219i Alexandria (aproximativ 800 km conform estim\u0103rilor contemporane), atunci \u00eenmul\u021birea acestei distan\u021be cu 50 ar da circumferin\u021ba total\u0103 a P\u0103m\u00e2ntului. Rezultat: aproximativ 40.000 km.<\/p>\n<p>Cifra real\u0103 de ast\u0103zi este de 40.075 km, ceea ce reprezint\u0103 o marj\u0103 de eroare minim\u0103, mai ales av\u00e2nd \u00een vedere c\u0103 a f\u0103cut-o f\u0103r\u0103 sateli\u021bi, ceasuri atomice sau calculatoare.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00cen urm\u0103 cu mai bine de 2.000 de ani, un \u00een\u021belept grec care tr\u0103ia \u00een Egipt a f\u0103cut ceva ce sun\u0103 a SF: a calculat circumferin\u021ba P\u0103m\u00e2ntului cu mare precizie, folosindu-se doar de observa\u021bie, geometrie \u0219i un b\u0103\u021b. Numele lui &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Impresionant! \u00cen urm\u0103 cu peste 2.000 de ani, un \u00een\u0163elept grec a calculat aproape exact m\u0103rimea P\u0103m\u00e2ntului, folosind doar un b\u0103\u0163 \u015fi umbra l\u0103sat\u0103 de Soare\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/impresionant-in-urma-cu-peste-2-000-de-ani-un-intelept-grec-a-calculat-aproape-exact-marimea-pamantului-folosind-doar-un-bat-si-umbra-lasata-de-soare\/#more-97676\" aria-label=\"Cite\u0219te mai multe despre Impresionant! \u00cen urm\u0103 cu peste 2.000 de ani, un \u00een\u0163elept grec a calculat aproape exact m\u0103rimea P\u0103m\u00e2ntului, folosind doar un b\u0103\u0163 \u015fi umbra l\u0103sat\u0103 de Soare\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":97677,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[106],"tags":[1772,3063,2784,386,4018,1912,10296,1751,3035,679,151,105,865,9434,9803,4255],"class_list":["post-97676","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-stiinta","tag-alexandria","tag-astronom","tag-biblioteca-din-alexandria","tag-egipt","tag-eratostene","tag-filosof","tag-geograf","tag-geometrie","tag-grec","tag-matematician","tag-oras","tag-pamant","tag-soare","tag-solstitiu-de-vara","tag-stiinta","tag-umbra","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.3 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Impresionant! \u00cen urm\u0103 cu peste 2.000 de ani, un \u00een\u0163elept grec a calculat aproape exact m\u0103rimea P\u0103m\u00e2ntului, folosind doar un b\u0103\u0163 \u015fi umbra l\u0103sat\u0103 de Soare - 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\/impresionant-in-urma-cu-peste-2-000-de-ani-un-intelept-grec-a-calculat-aproape-exact-marimea-pamantului-folosind-doar-un-bat-si-umbra-lasata-de-soare\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Impresionant! \u00cen urm\u0103 cu peste 2.000 de ani, un \u00een\u0163elept grec a calculat aproape exact m\u0103rimea P\u0103m\u00e2ntului, folosind doar un b\u0103\u0163 \u015fi umbra l\u0103sat\u0103 de Soare\" \/>\n<meta property=\"og:description\" content=\"\u00cen urm\u0103 cu mai bine de 2.000 de ani, un \u00een\u021belept grec care tr\u0103ia \u00een Egipt a f\u0103cut ceva ce sun\u0103 a SF: a calculat circumferin\u021ba P\u0103m\u00e2ntului cu mare precizie, folosindu-se doar de observa\u021bie, geometrie \u0219i un b\u0103\u021b. 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\u00cen urm\u0103 cu peste 2.000 de ani, un \u00een\u0163elept grec a calculat aproape exact m\u0103rimea P\u0103m\u00e2ntului, folosind doar un b\u0103\u0163 \u015fi umbra l\u0103sat\u0103 de Soare - Secretele lui Lovendal","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.lovendal.ro\/wp52\/impresionant-in-urma-cu-peste-2-000-de-ani-un-intelept-grec-a-calculat-aproape-exact-marimea-pamantului-folosind-doar-un-bat-si-umbra-lasata-de-soare\/","og_locale":"ro_RO","og_type":"article","og_title":"Impresionant! \u00cen urm\u0103 cu peste 2.000 de ani, un \u00een\u0163elept grec a calculat aproape exact m\u0103rimea P\u0103m\u00e2ntului, folosind doar un b\u0103\u0163 \u015fi umbra l\u0103sat\u0103 de Soare","og_description":"\u00cen urm\u0103 cu mai bine de 2.000 de ani, un \u00een\u021belept grec care tr\u0103ia \u00een Egipt a f\u0103cut ceva ce sun\u0103 a SF: a calculat circumferin\u021ba P\u0103m\u00e2ntului cu mare precizie, folosindu-se doar de observa\u021bie, geometrie \u0219i un b\u0103\u021b. Numele lui ... 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