{"id":119281,"date":"2025-12-29T07:36:07","date_gmt":"2025-12-29T07:36:07","guid":{"rendered":"https:\/\/www.europesays.com\/se\/119281\/"},"modified":"2025-12-29T07:36:07","modified_gmt":"2025-12-29T07:36:07","slug":"snart-25-timmars-dygn-det-har-hander-med-tiden-pa-jorden","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/se\/119281\/","title":{"rendered":"Snart 25-timmars dygn? Det h\u00e4r h\u00e4nder med tiden p\u00e5 jorden"},"content":{"rendered":"<p>N\u00e4r det talas om att jorden \u201dsnart\u201d f\u00e5r 25-timmarsdygn \u00e4r ordet snart kraftigt \u00f6verdrivet. F\u00f6r\u00e4ndringen sker s\u00e5 l\u00e5ngsamt att den inte m\u00e4rks i vardagen, trots att jordens rotation gradvis bromsas.<\/p>\n<p>Jorden roterar runt sin egen axel, och det \u00e4r denna rotation som ger oss det dygn vi \u00e4r vana vid \u2013 24 timmar fr\u00e5n soluppg\u00e5ng till soluppg\u00e5ng. Men s\u00e5 kommer det inte alltid att vara.<\/p>\n<p>Jordens rotation bromsas mycket l\u00e5ngsamt av <a href=\"https:\/\/www.ecoticias.com\/en\/goodbye-to-the-24-hour-day-from-this-date-onwards-days-on-earth-will-last-25-hours\/24912\/\" rel=\"nofollow noopener\" target=\"_blank\">gravitationseffekter<\/a>, fr\u00e4mst fr\u00e5n m\u00e5nen, vilket g\u00f6r att ett dygn gradvis blir l\u00e4ngre. <\/p>\n<p>Jorden och m\u00e5nen<\/p>\n<p>Den viktigaste orsaken till att dygnet v\u00e4xer \u00e4r m\u00e5nens inverkan p\u00e5 jordens tidvatten. <\/p>\n<p>Jordens hav buktar ut p\u00e5 grund av m\u00e5nens gravitation, vilket skapar tidvatten som stiger och sjunker n\u00e4r planeten roterar.\u00a0<\/p>\n<p>Dessa utbuktningar roterar n\u00e5got f\u00f6re m\u00e5nens bana runt jorden och skapar en friktion som gradvis \u00f6verf\u00f6r r\u00f6relseenergi fr\u00e5n jorden till m\u00e5nens omloppsbana. Det g\u00f6r att jordens rotation sakta saktas ner och m\u00e5nens avst\u00e5nd fr\u00e5n jorden \u00f6kar \u00f6ver tid.<\/p>\n<p>Forskare kan faktiskt m\u00e4ta denna bromsande effekt genom att j\u00e4mf\u00f6ra extremt precisa atomklockor med observationer av stj\u00e4rnors positioner och historiska data som gamla solf\u00f6rm\u00f6rkelser. Dessa j\u00e4mf\u00f6relser visar tydligt att jordens rotation inte \u00e4r konstant \u2013 om \u00e4n variationerna \u00e4r mikroskopiska p\u00e5 kort sikt.<\/p>\n","protected":false},"excerpt":{"rendered":"N\u00e4r det talas om att jorden \u201dsnart\u201d f\u00e5r 25-timmarsdygn \u00e4r ordet snart kraftigt \u00f6verdrivet. F\u00f6r\u00e4ndringen sker s\u00e5 l\u00e5ngsamt&hellip;\n","protected":false},"author":2,"featured_media":119282,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[66],"tags":[7676,12742,80,78,79,34,31,33,32,30,81,84,5933,83,82],"class_list":{"0":"post-119281","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-vetenskap-och-teknik","8":"tag-manen","9":"tag-planeter","10":"tag-science","11":"tag-science-and-technology","12":"tag-scienceandtechnology","13":"tag-se","14":"tag-svenska","15":"tag-sverige","16":"tag-sweden","17":"tag-swedish","18":"tag-technology","19":"tag-teknik","20":"tag-tid","21":"tag-vetenskap","22":"tag-vetenskapteknik"},"share_on_mastodon":{"url":"https:\/\/pubeurope.com\/@se\/115801711285799836","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/se\/wp-json\/wp\/v2\/posts\/119281","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/se\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/se\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/se\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/se\/wp-json\/wp\/v2\/comments?post=119281"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/se\/wp-json\/wp\/v2\/posts\/119281\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/se\/wp-json\/wp\/v2\/media\/119282"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/se\/wp-json\/wp\/v2\/media?parent=119281"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/se\/wp-json\/wp\/v2\/categories?post=119281"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/se\/wp-json\/wp\/v2\/tags?post=119281"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}