Novaatori lugeja m\u00e4rkas, et kuigi p\u00e4evad l\u00fchenevad edasi, on t\u00f6\u00f6lt koju s\u00f5ites \u00f5ues valgem kui n\u00e4dal aega tagasi. Kuidas on v\u00f5imalik, et \u00f5htud l\u00e4hevad p\u00e4ev-p\u00e4evalt juba valgemaks, kuigi kalendri j\u00e4rgi on aasta l\u00fchim p\u00e4ev alles ees? Vastab T\u00dc Tartu observatooriumi kaasprofessor Laurits Leedj\u00e4rv.<\/p>\n
Vastust v\u00f5iks alustada nii, et see, kui valge v\u00f5i pime t\u00f6\u00f6lt koju s\u00f5ites tundub olevat, on subjektiivne ja s\u00f5ltub lisaks p\u00e4ikeseloojangule suuresti ilmast. Kui ka veel lumi maas oleks, tunduks maailm palju valgem ja ilusam.<\/p>\n
Samas P\u00e4ike k\u00e4ib ikka oma rada ja objektiivsed andmed n\u00e4itavad, et varaseim p\u00e4ikeseloojang, kell 15.20, on Tallinnas iga p\u00e4ev 12.\u201319. detsembrini. Talvisel p\u00f6\u00f6rip\u00e4eval loojub p\u00e4ike juba minut hiljem ja aasta viimasel p\u00e4eval 15.30. Hiliseim p\u00e4ikeset\u00f5us, kell 9.19, on aga 26.\u201328. detsembrini. Tartu jaoks on vastavad kuup\u00e4evad 13.\u201318. detsember (p\u00e4ikeseloojang kell 15.21) ja 27.\u201328. detsember (p\u00e4ikeset\u00f5us kell 9.02). L\u00fchim p\u00e4ev on Tallinnas 19.\u201323. detsembrini (6 tundi ja 4 minutit), Tartus 18.\u201324. detsembrini (6 tundi ja 23 minutit).<\/p>\n
Miks hiliseim p\u00e4ikeset\u00f5us ja varaseim loojang pole t\u00e4pselt p\u00f6\u00f6rip\u00e4eval? Siin on m\u00e4ngus keeruline geomeetria. Maa orbiit \u00fcmber P\u00e4ikese pole t\u00e4pselt ringjoon, vaid ellips. Maa p\u00f6\u00f6rlemistelg ei ole risti selle tasapinnaga, milles Maa \u00fcmber P\u00e4ikese liigub, vaid on selle suhtes umbes 23,4 kraadise nurga all. Nende asjaolude koosm\u00f5ju t\u00f5ttu saabubki varaseim p\u00e4ikeseloojang enne p\u00f6\u00f6rip\u00e4eva. Loodetavasti usub lugeja seda ilma pikemate arutlusk\u00e4ikudeta t\u00f5elisest ja keskmisest p\u00e4ikeseajast ning ajav\u00f5rrandist.<\/p>\n
Veel hakkab silma, et Tartus on aasta l\u00fchim p\u00e4ev tunduvalt pikem kui Tallinnas. Siin toimib j\u00e4lle kaks efekti: Tartu on Tallinnast ida pool, kus p\u00e4ike t\u00f5useb niikuinii varem, ja l\u00f5una pool \u2013 mida l\u00f5una poole, seda pikemad on talvised p\u00e4evad. Tallinlastele lohutuseks v\u00f5ib veel \u00f6elda, et suvel on Tartu pikim p\u00e4ev l\u00fchem kui Tallinnas (vastavalt 18 tundi 20 minutit ja 18 tundi 42 minutit).<\/p>\n","protected":false},"excerpt":{"rendered":"Novaatori lugeja m\u00e4rkas, et kuigi p\u00e4evad l\u00fchenevad edasi, on t\u00f6\u00f6lt koju s\u00f5ites \u00f5ues valgem kui n\u00e4dal aega tagasi.…\n","protected":false},"author":2,"featured_media":66628,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[26,27,37,33,35,34,36,31,32,21,28,29,33968,33965,19,9935,33964,33967,21290,33966,2075,25,33969,23,24,33971,22,20,33970,30],"class_list":{"0":"post-66627","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-uldised-uudised","8":"tag-breaking-news","9":"tag-breakingnews","10":"tag-ee","11":"tag-eesti","12":"tag-eesti-keel","13":"tag-estonia","14":"tag-estonian","15":"tag-featured-news","16":"tag-featurednews","17":"tag-headlines","18":"tag-latest-news","19":"tag-latestnews","20":"tag-laurits-leedjarv","21":"tag-loojang","22":"tag-news","23":"tag-paike","24":"tag-paikeseloojang","25":"tag-paikesetous","26":"tag-pime-aeg","27":"tag-planeet-maa","28":"tag-pooripaev","29":"tag-populaarseimad-lood","30":"tag-talvine-pooripaev","31":"tag-top-stories","32":"tag-topstories","33":"tag-tu-tartu-observatoorium","34":"tag-uldised-uudised","35":"tag-uudised","36":"tag-valge-aeg","37":"tag-viimased-uudised"},"share_on_mastodon":{"url":"https:\/\/pubeurope.com\/@ee\/115734624498673905","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/posts\/66627","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/comments?post=66627"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/posts\/66627\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/media\/66628"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/media?parent=66627"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/categories?post=66627"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/tags?post=66627"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}