Forskel mellem versioner af "Bruger:Metalindustrien/Kasse1"

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==CausesÅrsag andog effectsvirkning==
===Aksehældning===
{{main|Effect of sun angle on climate}}
{{hovedartikel|Aksehældning}}
[[File:Seasonearth.png|thumb|right|upright=1.25|IlluminationOplysning ofaf EarthJorden atved eachhver changeændring ofi astronomicalastronomisk seasonårstid]]
 
[[File:seasons.svg|frame|right|Jordens [[aksehældning]] flugter med indgående [[sollys]] omkring [[vintersolhverv]] på den [[nordlige halvkugle]]. Uafhængigt af tidspunkt på dagen (dvs. uafhængigt af [[Jordens rotation]] om sin akse) så vil [[Sydpolen]] på dette tidspunkt være oplyst mens [[Nordpolen]] vil være mørk og opleve såkaldt [[polarnat]].]]
===Axial tilt===
[[File:Seasonearth.png|thumb|right|upright=1.25|Illumination of Earth at each change of astronomical season]]
 
[[File:seasons.svg|frame|right|This diagram shows how the tilt of [[Earth's axis]] aligns with incoming [[sunlight]] around the [[winter solstice]] of the [[Northern Hemisphere]]. Regardless of the time of day (i.e. the [[Earth's rotation]] on its axis), the [[North Pole]] will be dark and the [[South Pole]] will be illuminated; see also [[arctic winter]]. In addition to the density of [[angle of incidence (optics)|incident]] light, the [[dissipation]] of light in the [[Earth's atmosphere|atmosphere]] is greater when it falls at a shallow angle.]]
 
The seasons result from the Earth's [[axis of rotation]] being [[axial tilt#Earth|tilted]] with respect to its [[orbital plane (astronomy)|orbital plane]] by an angle of approximately 23.4 [[degree (angle)|degrees]].<ref>{{cite web|last=Cain|first=Fraiser|title=Tilt of the Earth|url=http://www.universetoday.com/26778/tilt-of-the-earth/|access-date=2 May 2014}}</ref> (This tilt is also known as "obliquity of the [[ecliptic]]".)