{"id":6729,"date":"2026-03-23T06:37:18","date_gmt":"2026-03-23T05:37:18","guid":{"rendered":"https:\/\/agora.xtec.cat\/ieslaroca\/?p=6729"},"modified":"2026-03-23T17:06:42","modified_gmt":"2026-03-23T16:06:42","slug":"experiment-deratosthenes","status":"publish","type":"post","link":"https:\/\/agora.xtec.cat\/ieslaroca\/general\/experiment-deratosthenes\/","title":{"rendered":"Experiment d’Eratosthenes"},"content":{"rendered":"\n

Els alumnes de l’INS de La Roca del Vall\u00e8s han participat en el projecte Eratothenes Experiment 2026<\/a> amb centres de tot el m\u00f3n. <\/p>\n\n\n\n

Seguint el procediment d’Erat\u00f2stenes, els alumnes van utilitzar un bast\u00f3 de 106 cm que va projectar una ombra de 96 cm a les 12:00 h. Amb trigonometria tan(\u03b1)=ombra\/pal, l’angle calculat dels rajos solars respecte a la vertical va ser d’aproximadament 42\u00ba.<\/p>\n\n\n\n

Utilitzant la dist\u00e0ncia geogr\u00e0fica de 4268 <\/strong>km fins a l’Equador i aplicant una regla de tres Angle\/360\u00ba=Dist\u00e0ncia\/Circumfer\u00e8ncia, s’obt\u00e9 una circumfer\u00e8ncia terrestre de <\/strong>39518 km. En comparaci\u00f3 amb la mesura real de 40.075 km, aquest resultat presenta un error aproximat del 2 %.<\/p>\n\n\n\n

\"\"<\/a><\/figure>\n\n\n\n
\"\"<\/a><\/figure>\n\n\n\n
\"\"<\/a><\/figure>\n","protected":false},"excerpt":{"rendered":"

Els alumnes de l’INS de La Roca del Vall\u00e8s han participat en el projecte Eratothenes Experiment 2026 amb centres de […]<\/p>\n","protected":false},"author":1,"featured_media":6737,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1,29],"tags":[],"class_list":["post-6729","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general","category-portada"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/agora.xtec.cat\/ieslaroca\/wp-json\/wp\/v2\/posts\/6729","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/agora.xtec.cat\/ieslaroca\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/agora.xtec.cat\/ieslaroca\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/ieslaroca\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/ieslaroca\/wp-json\/wp\/v2\/comments?post=6729"}],"version-history":[{"count":6,"href":"https:\/\/agora.xtec.cat\/ieslaroca\/wp-json\/wp\/v2\/posts\/6729\/revisions"}],"predecessor-version":[{"id":6751,"href":"https:\/\/agora.xtec.cat\/ieslaroca\/wp-json\/wp\/v2\/posts\/6729\/revisions\/6751"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/ieslaroca\/wp-json\/wp\/v2\/media\/6737"}],"wp:attachment":[{"href":"https:\/\/agora.xtec.cat\/ieslaroca\/wp-json\/wp\/v2\/media?parent=6729"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/agora.xtec.cat\/ieslaroca\/wp-json\/wp\/v2\/categories?post=6729"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/agora.xtec.cat\/ieslaroca\/wp-json\/wp\/v2\/tags?post=6729"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}