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{"id":12359,"date":"2015-05-30T03:31:41","date_gmt":"2015-05-30T02:31:41","guid":{"rendered":"https:\/\/www.acasinhadamatematica.pt\/?p=12359"},"modified":"2022-02-11T14:40:40","modified_gmt":"2022-02-11T14:40:40","slug":"eratostenes-e-a-medida-da-circunferencia-da-terra","status":"publish","type":"post","link":"https:\/\/www.acasinhadamatematica.pt\/?p=12359","title":{"rendered":"Erat\u00f3stenes e a medida da circunfer\u00eancia da Terra"},"content":{"rendered":"<div class=\"seriesmeta\">This entry is part 2 of 6 in the series <a href=\"https:\/\/www.acasinhadamatematica.pt\/?series=af-cfaoa\" class=\"series-640\" title=\"AF \u2013 CFAOA\">AF \u2013 CFAOA<\/a><\/div><h5><\/h5>\n<h5>Erat\u00f3stenes<\/h5>\n<p><a href=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/eratosth.jpg\"><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"12360\" data-permalink=\"https:\/\/www.acasinhadamatematica.pt\/?attachment_id=12360\" data-orig-file=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/eratosth.jpg\" data-orig-size=\"428,597\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Erat\u00f3stenes\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/eratosth.jpg\" class=\"alignright size-medium wp-image-12360\" src=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/eratosth-215x300.jpg\" alt=\"Erat\u00f3stenes\" width=\"215\" height=\"300\" srcset=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/eratosth-215x300.jpg 215w, https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/eratosth.jpg 428w\" sizes=\"auto, (max-width: 215px) 100vw, 215px\" \/><\/a><a href=\"https:\/\/en.wikipedia.org\/wiki\/Eratosthenes\" target=\"_blank\" rel=\"noopener noreferrer\">Erat\u00f3stenes de Cirene<\/a> (276 AC, Cirene &#8211; 194 AC, Alexandria), um amigo de <a href=\"https:\/\/en.wikipedia.org\/wiki\/Archimedes\" target=\"_blank\" rel=\"noopener noreferrer\">Arquimedes<\/a> de Siracusa, viveu em Alexandria. Nasceu em Cirene, um lugar na L\u00edbia, hoje chamado Shahat e que foi uma antiga col\u00f3nia grega.<\/p>\n<p>Trabalhou em geometria e n\u00fameros primos. Foi diretor da grande <a href=\"https:\/\/en.wikipedia.org\/wiki\/Library_of_Alexandria\" target=\"_blank\" rel=\"noopener noreferrer\">Biblioteca de Alexandria<\/a>. Ele \u00e9 mais conhecido pelo seu crivo de n\u00fameros primos (<a href=\"https:\/\/en.wikipedia.org\/wiki\/Sieve_of_Eratosthenes\" target=\"_blank\" rel=\"noopener noreferrer\">Crivo de Erat\u00f3stenes<\/a>) que, de forma modificada, ainda \u00e9 uma ferramenta importante na investiga\u00e7\u00e3o da teoria dos n\u00fameros. Erat\u00f3stenes mediu a inclina\u00e7\u00e3o do eixo da Terra com grande precis\u00e3o e compilou um cat\u00e1logo de 675 estrelas (hoje perdido); sugeriu que um dia bissexto fosse adicionado a cada quatro anos e tentou reconstruir o calend\u00e1rio. Cegou na velhice e \u00e9 dito ter cometido suic\u00eddio por inani\u00e7\u00e3o, como <a href=\"https:\/\/en.wikipedia.org\/wiki\/Democritus\" target=\"_blank\" rel=\"noopener noreferrer\">Dem\u00f3crito<\/a>.<\/p>\n<p>Erat\u00f3stenes veio de Atenas para Alexandria a fim de ser o bibliotec\u00e1rio-chefe de <a href=\"https:\/\/pt.wikipedia.org\/wiki\/Ptolemeu_III_Ev%C3%A9rgeta\" target=\"_blank\" rel=\"noopener noreferrer\">Ptolemeu III Ev\u00e9rgeta<\/a>. Erat\u00f3stenes n\u00e3o foi apenas um astr\u00f3nomo e ge\u00f3grafo, mas tamb\u00e9m um poeta e gram\u00e1tico. De brincadeira, os seus contempor\u00e2neos chamaram-no <strong><em>Beta o Segundo<\/em><\/strong>, porque, ao longo da universalidade das suas realiza\u00e7\u00f5es, ele disse ser &#8220;um segundo <a href=\"https:\/\/pt.wikipedia.org\/wiki\/Plat%C3%A3o\" target=\"_blank\" rel=\"noopener noreferrer\">Plat\u00e3o<\/a>&#8221; na filosofia, &#8220;um segundo <a href=\"https:\/\/en.wikipedia.org\/wiki\/Thales\" target=\"_blank\" rel=\"noopener noreferrer\">Tales<\/a>&#8221; em astronomia, e assim por diante em toda a lista. Pela mesma raz\u00e3o, foi chamado de Pentatlos o que significa atleta em cinco disciplinas.<\/p>\n<p>O que sabemos de Erat\u00f3stenes \u00e9 por <a href=\"https:\/\/en.wikipedia.org\/wiki\/Strabo\" target=\"_blank\" rel=\"noopener noreferrer\">Estrab\u00e3o<\/a> e <a href=\"https:\/\/en.wikipedia.org\/wiki\/Cleomedes\" target=\"_blank\" rel=\"noopener noreferrer\">Cleomedes<\/a>, que sobre ele escreveram 150-200 anos depois.<\/p>\n<h5>Sobre a medida da circunfer\u00eancia da Terra<\/h5>\n<p>A antiga cidade de Siena (hoje conhecida como Assu\u00e3o) est\u00e1 localizada a sul de Alexandria, a uma dist\u00e2ncia de 5.000 est\u00e1dios gregos.<\/p>\n<table class=\" aligncenter\" style=\"width: 90%;\">\n<tbody>\n<tr>\n<td><a href=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/alexandria-siena1.png\"><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"12361\" data-permalink=\"https:\/\/www.acasinhadamatematica.pt\/?attachment_id=12361\" data-orig-file=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/alexandria-siena1.png\" data-orig-size=\"975,637\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Alexandria-Siena\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/alexandria-siena1.png\" class=\"alignnone wp-image-12361\" src=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/alexandria-siena1-300x196.png\" alt=\"Alexandria-Siena\" width=\"420\" height=\"274\" srcset=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/alexandria-siena1-300x196.png 300w, https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/alexandria-siena1.png 975w\" sizes=\"auto, (max-width: 420px) 100vw, 420px\" \/><\/a><\/td>\n<td><a href=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/alexandria-siena2.png\"><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"12362\" data-permalink=\"https:\/\/www.acasinhadamatematica.pt\/?attachment_id=12362\" data-orig-file=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/alexandria-siena2.png\" data-orig-size=\"740,660\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Alexandria-Siena\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/alexandria-siena2.png\" class=\"alignnone wp-image-12362\" src=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/alexandria-siena2-300x268.png\" alt=\"Alexandria-Siena\" width=\"307\" height=\"274\" srcset=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/alexandria-siena2-300x268.png 300w, https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/alexandria-siena2.png 740w\" sizes=\"auto, (max-width: 307px) 100vw, 307px\" \/><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Em Siena existe um po\u00e7o muito profundo. Todos os anos, ao meio-dia, no dia do solst\u00edcio de ver\u00e3o (21 de junho), a luz do Sol ilumina a \u00e1gua no fundo deste po\u00e7o. Naquele momento, o Sol est\u00e1 diretamente em cima e n\u00e3o h\u00e1 sombras na cidade de Siena.<\/p>\n<table class=\" aligncenter\" style=\"width: 90%;\">\n<tbody>\n<tr style=\"background-color: #ffffff;\">\n<td><a href=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/poco-siena2.jpg\"><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"12363\" data-permalink=\"https:\/\/www.acasinhadamatematica.pt\/?attachment_id=12363\" data-orig-file=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/poco-siena2.jpg\" data-orig-size=\"395,259\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Po\u00e7o de Erat\u00f3stenes em Siena\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/poco-siena2.jpg\" class=\"alignnone wp-image-12363\" src=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/poco-siena2.jpg\" alt=\"Po\u00e7o de Erat\u00f3stenes em Siena\" width=\"360\" height=\"236\" srcset=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/poco-siena2.jpg 395w, https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/poco-siena2-300x197.jpg 300w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/><\/a><\/td>\n<td><a href=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/poco-siena1.jpg\"><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"12364\" data-permalink=\"https:\/\/www.acasinhadamatematica.pt\/?attachment_id=12364\" data-orig-file=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/poco-siena1.jpg\" data-orig-size=\"461,295\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Po\u00e7o de Erat\u00f3stenes em Siena\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/poco-siena1.jpg\" class=\"alignnone wp-image-12364\" src=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/poco-siena1-300x192.jpg\" alt=\"Po\u00e7o de Erat\u00f3stenes em Siena\" width=\"369\" height=\"236\" srcset=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/poco-siena1-300x192.jpg 300w, https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/poco-siena1.jpg 461w\" sizes=\"auto, (max-width: 369px) 100vw, 369px\" \/><\/a><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\" colspan=\"2\">Po\u00e7o de\u00a0 Erat\u00f3stenes, em Siena<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Erat\u00f3stenes inventou, provavelmente por volta de 205 AC, um belo m\u00e9todo para medir a circunfer\u00eancia da Terra. Publicou os detalhes do seu m\u00e9todo no trabalho<em> Sobre a medi\u00e7\u00e3o da Terra<\/em> que, infelizmente, se perdeu. O que sabemos sobre o seu m\u00e9todo \u00e9 proporcionado indiretamente por outros autores, principalmente Cleomedes e <a href=\"https:\/\/en.wikipedia.org\/wiki\/Theon_of_Smyrna\" target=\"_blank\" rel=\"noopener noreferrer\">Teon de Esmirna<\/a>.<\/p>\n<p>Erat\u00f3stenes observou que, no solst\u00edcio de ver\u00e3o, o Sol n\u00e3o produzia sombra em Siena, mas ele sabia que a produzia em Alexandria, a norte de Siena, correspondendo a um \u00e2ngulo \\(\\alpha\u00a0 = 7^\\circ \\;12&#8217;\\) (ou \\(\\alpha\u00a0 = 7,2^\\circ \\)).<\/p>\n<p>Erat\u00f3stenes obteve o \u00e2ngulo\u00a0\\(\\alpha \\) a partir do comprimento de uma sombra produzida pelo Sol, ao meio-dia, no solst\u00edcio de ver\u00e3o, em Alexandria, utilizando um objeto, de altura conhecida, perpendicular ao solo, tal como um obelisco ou um <a href=\"https:\/\/en.wikipedia.org\/wiki\/Gnomon\" target=\"_blank\" rel=\"noopener noreferrer\">gn\u00f3mon<\/a>.<\/p>\n<p>Concluiu que a altera\u00e7\u00e3o do \u00e2ngulo da sombra era causado pela forma esf\u00e9rica da Terra (Arist\u00f3teles e outros j\u00e1 tinham este conhecimento) e que seria poss\u00edvel obter a medida da circunfer\u00eancia da Terra a partir deste \u00e2ngulo.<\/p>\n<p><ul id='GTTabs_ul_12359' class='GTTabs' style='display:none'>\n<li id='GTTabs_li_0_12359' class='GTTabs_curr'><a  id=\"12359_0\" onMouseOver=\"GTTabsShowLinks('Tarefa'); return true;\"  onMouseOut=\"GTTabsShowLinks();\"  class='GTTabsLinks'>Tarefa<\/a><\/li>\n<li id='GTTabs_li_1_12359' ><a  id=\"12359_1\" onMouseOver=\"GTTabsShowLinks('Uma explica\u00e7\u00e3o de Carl Sagan'); return true;\"  onMouseOut=\"GTTabsShowLinks();\"  class='GTTabsLinks'>Uma explica\u00e7\u00e3o de Carl Sagan<\/a><\/li>\n<li id='GTTabs_li_2_12359' ><a  id=\"12359_2\" onMouseOver=\"GTTabsShowLinks('Solu\u00e7\u00e3o'); return true;\"  onMouseOut=\"GTTabsShowLinks();\"  class='GTTabsLinks'>Solu\u00e7\u00e3o<\/a><\/li>\n<li id='GTTabs_li_3_12359' ><a  id=\"12359_3\" onMouseOver=\"GTTabsShowLinks('<em>Isto \u00e9 Matem\u00e1tica<\/em>: O Raio da Terra'); return true;\"  onMouseOut=\"GTTabsShowLinks();\"  class='GTTabsLinks'><em>Isto \u00e9 Matem\u00e1tica<\/em>: O Raio da Terra<\/a><\/li>\n<li id='GTTabs_li_4_12359' ><a  id=\"12359_4\" onMouseOver=\"GTTabsShowLinks('A Fa\u00e7anha de Erat\u00f3steles'); return true;\"  onMouseOut=\"GTTabsShowLinks();\"  class='GTTabsLinks'>A Fa\u00e7anha de Erat\u00f3steles<\/a><\/li>\n<li id='GTTabs_li_5_12359' ><a  id=\"12359_5\" onMouseOver=\"GTTabsShowLinks('V\u00eddeos'); return true;\"  onMouseOut=\"GTTabsShowLinks();\"  class='GTTabsLinks'>V\u00eddeos<\/a><\/li>\n<\/ul>\n\n<div class='GTTabs_divs GTTabs_curr_div' id='GTTabs_0_12359'>\n<span class='GTTabs_titles'><b>Tarefa<\/b><\/span><\/p>\n<h5>Tarefa<\/h5>\n<p>Considerando a Terra esf\u00e9rica, que Alexandria se encontra exatamente a norte de Siena e que os raios de luz do Sol que atingem a Terra s\u00e3o paralelos,\u00a0investigue na anima\u00e7\u00e3o seguinte\u00a0o\u00a0m\u00e9todo que Erat\u00f3stenes ter\u00e1 usado para determinar a medida da sua circunfer\u00eancia e valide-o matematicamente.<\/p>\n<p>Calcule o valor a que Erat\u00f3stenes ter\u00e1 chegado para medida da circunfer\u00eancia da Terra, tendo em conta os dados indicados acima.<\/p>\n<p style=\"text-align: center;\"><script src=\"https:\/\/cdn.geogebra.org\/apps\/deployggb.js\"><\/script>\r\n<div id=\"ggbApplet\" style=\"margin: 0 auto;\"><\/div>\r\n<script>\r\nvar parameters = {\r\n\"id\": \"ggbApplet\",\r\n\"width\":725,\r\n\"height\":500,\r\n\"showMenuBar\":false,\r\n\"showAlgebraInput\":false,\r\n\"showToolBar\":false,\r\n\"customToolBar\":\"0 39 | 1 501 67 , 5 19 , 72 | 2 15 45 , 18 65 , 7 37 | 4 3 8 9 , 13 44 , 58 , 47 | 16 51 64 , 70 | 10 34 53 11 , 24  20 22 , 21 23 | 55 56 57 , 12 | 36 46 , 38 49  50 , 71 | 30 29 54 32 31 33 | 17 26 62 73 , 14 68 | 25 52 60 61 | 40 41 42 , 27 28 35 , 6\",\r\n\"showToolBarHelp\":false,\r\n\"showResetIcon\":true,\r\n\"enableLabelDrags\":false,\r\n\"enableShiftDragZoom\":false,\r\n\"enableRightClick\":false,\r\n\"errorDialogsActive\":false,\r\n\"useBrowserForJS\":false,\r\n\"preventFocus\":false,\r\n\"language\":\"pt\",\r\n\/\/ use this instead of ggbBase64 to load a material from GeoGebraTube\r\n\/\/ 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is3D=is 3D applet using 3D view, AV=Algebra View, SV=Spreadsheet View, CV=CAS View, EV2=Graphics View 2, CP=Construction Protocol, PC=Probability Calculator, DA=Data Analysis, FI=Function Inspector, PV=Python, macro=Macro View\r\nvar views = {'is3D': 0,'AV': 0,'SV': 0,'CV': 0,'EV2': 0,'CP': 0,'PC': 0,'DA': 0,'FI': 0,'PV': 0,'macro': 0};\r\nvar applet = new GGBApplet(parameters, '5.0', views);\r\nwindow.onload = function() {applet.inject('ggbApplet')};\r\n<\/script><\/p>\n<p style=\"text-align: center;\">Arraste o ponto S (Siena).<\/p>\n<p style=\"text-align: left;\">\n<p style=\"text-align: left;\">Em caso de necessidade, atente \u00e0 explica\u00e7\u00e3o de <a href=\"https:\/\/pt.wikipedia.org\/wiki\/Carl_Sagan\" target=\"_blank\" rel=\"noopener noreferrer\">Carl Sagan<\/a> sobre a experi\u00eancia de Erat\u00f3stenes na medi\u00e7\u00e3o da circunfer\u00eancia da Terra.<\/p>\n<p><div class='GTTabsNavigation' style='display:none'><span class='GTTabs_nav_next'><a href='#GTTabs_ul_12359' onClick='GTTabs_show(1,12359)'>Uma explica\u00e7\u00e3o de Carl Sagan &gt;&gt;<\/a><\/span><\/div><\/div>\n\n<div class='GTTabs_divs' id='GTTabs_1_12359'>\n<span class='GTTabs_titles'><b>Uma explica\u00e7\u00e3o de Carl Sagan<\/b><\/span><\/p>\n<h5>Uma explica\u00e7\u00e3o de Carl Sagan<\/h5>\n<p>Trata-se de um trecho do primeiro epis\u00f3dio da s\u00e9rie de TV chamada Cosmos: Uma Viagem Pessoal, que \u00e9 dividida em 13 partes, escrita por Carl Sagan, Ann Druyan e Steven Soter, com Sagan como apresentador e que foi\u00a0transmitida nos anos 80 e 90.<\/p>\n<p>Neste trecho Carl Sagan explica a experi\u00eancia de Erat\u00f3stenes na medi\u00e7\u00e3o da circunfer\u00eancia da Terra.<\/p>\n<p style=\"text-align: center;\"><iframe loading=\"lazy\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube-nocookie.com\/embed\/VWU1YoFZIzU?rel=0\" frameborder=\"0\" allowfullscreen><\/iframe><\/p>\n<p><div class='GTTabsNavigation' style='display:none'><span class='GTTabs_nav_prev'><a href='#GTTabs_ul_12359' onClick='GTTabs_show(0,12359)'>&lt;&lt; Tarefa<\/a><\/span><span class='GTTabs_nav_next'><a href='#GTTabs_ul_12359' onClick='GTTabs_show(2,12359)'>Solu\u00e7\u00e3o &gt;&gt;<\/a><\/span><\/div><\/div>\n\n<div class='GTTabs_divs' id='GTTabs_2_12359'>\n<span class='GTTabs_titles'><b>Solu\u00e7\u00e3o<\/b><\/span><\/p>\n<h5>Solu\u00e7\u00e3o<\/h5>\n<p><a href=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/SienaAlexandria-2.png\"><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"12365\" data-permalink=\"https:\/\/www.acasinhadamatematica.pt\/?attachment_id=12365\" data-orig-file=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/SienaAlexandria-2.png\" data-orig-size=\"563,571\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Siena Alexandria\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/SienaAlexandria-2.png\" class=\"alignright wp-image-12365\" src=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/SienaAlexandria-2-296x300.png\" alt=\"Siena Alexandria\" width=\"500\" height=\"507\" srcset=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/SienaAlexandria-2-296x300.png 296w, https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/SienaAlexandria-2.png 563w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a>Erat\u00f3stenes usa as seguintes seis principais premissas como hip\u00f3teses para a sua famosa aproxima\u00e7\u00e3o da medida da circunfer\u00eancia da Terra:<\/p>\n<ul>\n<li>As cidades Alexandria e Siena est\u00e3o no mesmo meridiano;<\/li>\n<li>A cidade de Siena est\u00e1 sobre o Tr\u00f3pico de C\u00e2ncer (n\u00e3o h\u00e1 sombra de objetos verticais);<\/li>\n<li>Os raios de luz do Sol que atingem a Terra s\u00e3o paralelos;<\/li>\n<li>A dist\u00e2ncia entre Alexandria e Siena \u00e9 de 5.000 est\u00e1dios;<\/li>\n<li>A amplitude do \u00e2ngulo associado \u00e0 sombra verificada em Alexandria \u00e9 \\(7,2^\\circ \\), ou seja, \\(\\frac{1}{{50}}\\) da amplitude de uma circunfer\u00eancia;<\/li>\n<li>A Terra \u00e9 esf\u00e9rica.<\/li>\n<\/ul>\n<p style=\"text-align: left;\">\n<p style=\"text-align: left;\">Seja $c$ o comprimento do arco AS e $P$ o comprimento da circunfer\u00eancia da Terra.<\/p>\n<p style=\"text-align: left;\">Como o comprimento do arco AS \u00e9 diretamente proporcional \u00e0 amplitude do \u00e2ngulo \\(\\beta \\), temos:\\[\\frac{c}{P} = \\frac{{\\widehat \\beta }}{{360^\\circ }}\\]<\/p>\n<p style=\"text-align: left;\">De acordo com os pressupostos de Erat\u00f3stenes, os \u00e2ngulos\u00a0 \\(\\alpha \\) e \\(\\beta \\) s\u00e3o alternos internos.<br \/>\nConsequentemente, os \u00e2ngulos\u00a0 \\(\\alpha \\) e \\(\\beta \\) s\u00e3o congruentes. Logo, \\(\\widehat \\beta\u00a0 = \\widehat \\alpha\u00a0 = \\frac{{360^\\circ }}{{50}}\\).<\/p>\n<p style=\"text-align: left;\">Substituindo os valores conhecidos na propor\u00e7\u00e3o estabelecida acima, vem:\\[\\begin{array}{*{20}{c}}{\\frac{{5000}}{P} = \\frac{{\\frac{{360^\\circ }}{{50}}}}{{360^\\circ }}}&amp; \\Leftrightarrow &amp;{\\frac{{5000}}{P} = \\frac{1}{{50}}}&amp; \\Leftrightarrow &amp;{P = 250000}\\end{array}\\]<\/p>\n<p style=\"text-align: left;\">Portanto, Erat\u00f3stenes ter\u00e1 obtido 250.000 est\u00e1dios para medida da circunfer\u00eancia da Terra.<\/p>\n<p style=\"text-align: left;\">\n<p style=\"text-align: left;\">O m\u00e9todo concebido por Erat\u00f3stenes \u00e9 a base do m\u00e9todo complexo que ainda hoje \u00e9 usado para medir a Terra. O seu elegante argumento geom\u00e9trico, ilustrado acima, \u00e9 s\u00f3lido e simples. A sua aproxima\u00e7\u00e3o n\u00e3o seria ultrapassada nos s\u00e9culos vindouros.<\/p>\n<p style=\"text-align: left;\">\n<p style=\"text-align: left;\"><div class='GTTabsNavigation' style='display:none'><span class='GTTabs_nav_prev'><a href='#GTTabs_ul_12359' onClick='GTTabs_show(1,12359)'>&lt;&lt; Uma explica\u00e7\u00e3o de Carl Sagan<\/a><\/span><span class='GTTabs_nav_next'><a href='#GTTabs_ul_12359' onClick='GTTabs_show(3,12359)'><em>Isto \u00e9 Matem\u00e1tica<\/em>: O Raio da Terra &gt;&gt;<\/a><\/span><\/div><\/div>\n\n<div class='GTTabs_divs' id='GTTabs_3_12359'>\n<span class='GTTabs_titles'><b><em>Isto \u00e9 Matem\u00e1tica<\/em>: O Raio da Terra<\/b><\/span><\/p>\n<h5><em>Isto \u00e9 Matem\u00e1tica<\/em>: O Raio da Terra<\/h5>\n<p id=\"eow-description\">&#8220;O Raio da Terra&#8221;<br \/>\nPara al\u00e9m de erradamente parecer insultar a Terra, neste epis\u00f3dio o matem\u00e1tico Rog\u00e9rio Martins ir\u00e1 medir o per\u00edmetro do nosso planeta usando dois paus, um fio de prumo e uma bicicleta BTT.<br \/>\nE Isto \u00e9 Matem\u00e1tica.<\/p>\n<p style=\"text-align: center;\"><iframe loading=\"lazy\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube-nocookie.com\/embed\/KrVBgBVIXe4?rel=0\" frameborder=\"0\" allowfullscreen><\/iframe><\/p>\n<p><div class='GTTabsNavigation' style='display:none'><span class='GTTabs_nav_prev'><a href='#GTTabs_ul_12359' onClick='GTTabs_show(2,12359)'>&lt;&lt; Solu\u00e7\u00e3o<\/a><\/span><span class='GTTabs_nav_next'><a href='#GTTabs_ul_12359' onClick='GTTabs_show(4,12359)'>A Fa\u00e7anha de Erat\u00f3steles &gt;&gt;<\/a><\/span><\/div><\/div>\n\n<div class='GTTabs_divs' id='GTTabs_4_12359'>\n<span class='GTTabs_titles'><b>A Fa\u00e7anha de Erat\u00f3steles<\/b><\/span><\/p>\n<h5>A Fa\u00e7anha de Erat\u00f3steles<\/h5>\n<div id=\"attachment_12366\" style=\"width: 610px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/sombra-muro.png\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-12366\" data-attachment-id=\"12366\" data-permalink=\"https:\/\/www.acasinhadamatematica.pt\/?attachment_id=12366\" data-orig-file=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/sombra-muro.png\" data-orig-size=\"983,885\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"sombra-muro\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/sombra-muro.png\" class=\"wp-image-12366\" src=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/sombra-muro-300x270.png\" alt=\"sombra-muro\" width=\"600\" height=\"540\" srcset=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/sombra-muro-300x270.png 300w, https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/sombra-muro.png 983w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><p id=\"caption-attachment-12366\" class=\"wp-caption-text\">DOWN TO EARTH: Mapping for Everybody, By DAVID GREENHOOD With Illustrations by Ralph Graeter, New York: Holiday House, 1951<\/p><\/div>\n<p style=\"text-align: center;\"><iframe loading=\"lazy\" width=\"900\" height=\"700\" src=\"http:\/\/hdl.handle.net\/2027\/mdp.39015008389010?urlappend=%3Bui=embed\"><\/iframe><\/p>\n<p><div class='GTTabsNavigation' style='display:none'><span class='GTTabs_nav_prev'><a href='#GTTabs_ul_12359' onClick='GTTabs_show(3,12359)'>&lt;&lt; <em>Isto \u00e9 Matem\u00e1tica<\/em>: O Raio da Terra<\/a><\/span><span class='GTTabs_nav_next'><a href='#GTTabs_ul_12359' onClick='GTTabs_show(5,12359)'>V\u00eddeos &gt;&gt;<\/a><\/span><\/div><\/div>\n\n<div class='GTTabs_divs' id='GTTabs_5_12359'>\n<span class='GTTabs_titles'><b>V\u00eddeos<\/b><\/span><\/p>\n<p style=\"text-align: center;\"><iframe loading=\"lazy\" width=\"640\" height=\"480\" src=\"https:\/\/www.youtube-nocookie.com\/embed\/bgbmmkXm02g?rel=0\" frameborder=\"0\" allowfullscreen><\/iframe><\/p>\n<p style=\"text-align: center;\"><iframe loading=\"lazy\" width=\"640\" height=\"480\" src=\"https:\/\/www.youtube-nocookie.com\/embed\/rIF6Vj6pVNg?rel=0\" frameborder=\"0\" allowfullscreen><\/iframe><\/p>\n<p style=\"text-align: center;\"><iframe loading=\"lazy\" width=\"640\" height=\"480\" src=\"https:\/\/www.youtube-nocookie.com\/embed\/uLaJ3ewc9co?rel=0\" frameborder=\"0\" allowfullscreen><\/iframe><\/p>\n<p style=\"text-align: center;\"><iframe loading=\"lazy\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube-nocookie.com\/embed\/Cce1XJ3BCxg?rel=0\" frameborder=\"0\" allowfullscreen><\/iframe><\/p>\n<p><div class='GTTabsNavigation' style='display:none'><span class='GTTabs_nav_prev'><a href='#GTTabs_ul_12359' onClick='GTTabs_show(4,12359)'>&lt;&lt; A Fa\u00e7anha de Erat\u00f3steles<\/a><\/span><\/div><\/div>\n\n<\/p>\n<h5>Algumas Observa\u00e7\u00f5es<\/h5>\n<p>O conhecimento de Erat\u00f3stenes sobre dist\u00e2ncias foi fundado no trabalho de muitas gera\u00e7\u00f5es no levantamento topogr\u00e1fico em viagens no Egito. Os escrivas fara\u00f3nicos davam uma dist\u00e2ncia entre Siena e Alexandria de 5.000 est\u00e1dios. Esta dist\u00e2ncia foi corroborada questionando sobre o tempo que levava a viagem de camelo de Siena para Alexandria. Erat\u00f3stenes ter\u00e1 arredondado o resultado para um valor final de 700 est\u00e1dios por grau, o que implica uma circunfer\u00eancia de 252 mil est\u00e1dios. Alguns afirmam que Erat\u00f3stenes usou o est\u00e1dio eg\u00edpcio de 157,5 metros, o que implicaria uma circunfer\u00eancia de 39.690 km, apresentando um erro de 1,6%, mas o est\u00e1dio \u00c1tico de 185 metros \u00e9 o valor mais comumente aceite para o comprimento do est\u00e1dio utilizado por Erat\u00f3stenes nas suas medi\u00e7\u00f5es da Terra, que implicam uma circunfer\u00eancia de 46.620 km, apresentando um erro de 16,3%.<\/p>\n<p>Sem preju\u00edzo do seu grande feito, \u00e9 improv\u00e1vel, contudo, que Erat\u00f3stenes tenha obtido uma medi\u00e7\u00e3o precisa (nos padr\u00f5es atuais) da circunfer\u00eancia da Terra, face aos erros nos pressupostos que fez:<\/p>\n<ul>\n<li>As cidades Alexandria e Siena n\u00e3o est\u00e3o no mesmo meridiano;<\/li>\n<li>A cidade de Siena n\u00e3o est\u00e1 sobre o Tr\u00f3pico de C\u00e2ncer (est\u00e1 situada 55 km mais a norte);<\/li>\n<li>A Terra n\u00e3o \u00e9 esf\u00e9rica;<\/li>\n<li>Os raios de luz do Sol que atingem a Terra n\u00e3o s\u00e3o paralelos;<\/li>\n<li>A dist\u00e2ncia entre Alexandria e Siena n\u00e3o \u00e9 de 5.000 est\u00e1dios.<\/li>\n<\/ul>\n<h5>Conclus\u00e3o<\/h5>\n<p>As especificidades de medi\u00e7\u00e3o de Erat\u00f3stenes podem iludir-nos, simplesmente porque Erat\u00f3stenes n\u00e3o tinha especificidades em mente quando realizou esse c\u00e1lculo.<\/p>\n<p>A aproxima\u00e7\u00e3o da circunfer\u00eancia da Terra de Erat\u00f3stenes \u00e9 um belo argumento matem\u00e1tico, independentemente da precis\u00e3o do seu resultado. O moderno comprimento equivalente ao est\u00e1dio usado por Erat\u00f3stenes pode nunca ser conhecido, assim como a raz\u00e3o para a adi\u00e7\u00e3o de 2.000 est\u00e1dios pode nunca ser descoberta. No entanto, Erat\u00f3stenes ajudou a lan\u00e7ar as bases para a ci\u00eancia com base na matem\u00e1tica e na observa\u00e7\u00e3o emp\u00edrica, em vez de mera especula\u00e7\u00e3o filos\u00f3fica. Mais importante ainda, ele demonstrou o incr\u00edvel poder da matem\u00e1tica como uma ferramenta para modelar o nosso mundo.<\/p>\n<p>Fontes:<\/p>\n<ul>\n<li>Hellenic World encyclopaedia\u00a0\u2013\u00a0<a href=\"http:\/\/www.hellenicaworld.com\/Greece\/Science\/en\/Eratosthenes.html\" target=\"_blank\" rel=\"noopener noreferrer\">Eratosthenes of Cyrene<\/a><\/li>\n<li>School of Mathematics and Statistics, University of St Andrews, Scotland:\u00a0<a href=\"http:\/\/www-history.mcs.st-and.ac.uk\/Biographies\/Eratosthenes.html\" target=\"_blank\" rel=\"noopener noreferrer\">Eratosthenes of Cyrene<\/a><\/li>\n<li>New World Encyclopedia \u2013\u00a0<a href=\"http:\/\/www.newworldencyclopedia.org\/entry\/Eratosthenes\" target=\"_blank\" rel=\"noopener noreferrer\">Eratosthenes<\/a><\/li>\n<li>Dodwell: The Obliquity of the Ecliptic \u2013\u00a0<a href=\"http:\/\/www.setterfield.org\/Dodwell\/Dodwell_Manuscript_5.html\" target=\"_blank\" rel=\"noopener noreferrer\">Ancient Greek Observations<\/a><\/li>\n<li>Wikip\u00e9dia &#8211; <a href=\"http:\/\/en.wikipedia.org\/wiki\/Eratosthenes\" target=\"_blank\" rel=\"noopener noreferrer\">Eratosthenes<\/a><\/li>\n<li>Mathematical Association of America\u00a0\u2013\u00a0<a href=\"http:\/\/www.maa.org\/publications\/periodicals\/convergence\/eratosthenes-and-the-mystery-of-the-stades-how-long-is-a-stade\" target=\"_blank\" rel=\"noopener noreferrer\">Eratosthenes and the Mystery of the Stades &#8211; How Long Is a Stade?<\/a><\/li>\n<li>Quarterly Journal of the Royal Astronomical Society, Vol. 16, p.152, Irene Fisher\u00a0\u2013 <a href=\"http:\/\/adsabs.harvard.edu\/full\/1975QJRAS..16..152F\" target=\"_blank\" rel=\"noopener noreferrer\">Another Look at Eratosthenes&#8217;and Posidonius&#8217; Determinations of the Earth&#8217;s Circumference<\/a><\/li>\n<li><a href=\"http:\/\/hdl.handle.net\/2027\/mdp.39015008389010\" target=\"_blank\" rel=\"noopener noreferrer\">DOWN TO EARTH: Mapping for Everybody, By DAVID GREENHOOD With Illustrations by Ralph Graeter<\/a><\/li>\n<li>Encyclop\u00e6dia Britannica &#8211; <a href=\"http:\/\/www.britannica.com\/biography\/Eratosthenes-of-Cyrene\" target=\"_blank\" rel=\"noopener noreferrer\">Eratosthenes of Cyrene * Greek scientist<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<div class=\"seriesmeta\">This entry is part 2 of 6 in the series <a href=\"https:\/\/www.acasinhadamatematica.pt\/?series=af-cfaoa\" class=\"series-640\" title=\"AF \u2013 CFAOA\">AF \u2013 CFAOA<\/a><\/div><p>Erat\u00f3stenes Erat\u00f3stenes de Cirene (276 AC, Cirene &#8211; 194 AC, Alexandria), um amigo de Arquimedes de Siracusa, viveu em Alexandria. Nasceu em Cirene, um lugar na L\u00edbia, hoje chamado Shahat e que foi uma&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":21316,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[413,411,4,3],"tags":[412,414,9,80],"series":[640],"class_list":["post-12359","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-af-cfaoa","category-astronomia","category-ciencia-e-tecnologia","category-matematica","tag-astronomia","tag-eratostenes","tag-historia-da-matematica","tag-matematica-2","series-af-cfaoa"],"views":13165,"jetpack_featured_media_url":"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2015\/05\/sombra-muro2_520x245.png","jetpack_sharing_enabled":true,"jetpack_likes_enabled":true,"_links":{"self":[{"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=\/wp\/v2\/posts\/12359","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=12359"}],"version-history":[{"count":0,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=\/wp\/v2\/posts\/12359\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=\/wp\/v2\/media\/21316"}],"wp:attachment":[{"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=12359"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12359"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12359"},{"taxonomy":"series","embeddable":true,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=%2Fwp%2Fv2%2Fseries&post=12359"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}