What is Polar night?
[[File:Morketidettermiddag.JPG|thumb|200px|right|Early afternoon in [[Tromsø]]. This photo was taken in December.]] The '''polar night''' is when it stays dark outside for more than twenty four hours. This occurs only inside the [[polar circle]]s (the northernmost and southernmost areas on [[Earth]]).<ref>{{cite book|last=Burn|first=Chris|title=The Polar Night|url=http://nwtresearch.com/sites/default/files/the-polar-night.pdf|publisher=The Aurora Research Institute|accessdate=28 September 2015}}</ref> A lot of times It will be a polar night for the winter and the opposite happens in the summer. == References == {{reflist}} == Other websites == * [https://web.archive.org/web/20120904173515/http://collections.ic.gc.ca/simply_science/toc.htm The polar night and polar darkness] * [http://weather.cs.uit.no/video/index-2006.html Many years' of webcam pictures from Tromsø, Norway.] These clearly show the progression into and away from winter at a latitude within the Arctic Circle. {{multistub|geo|science}} [[Category:Geography]] [[Category:Astronomical phenomena]]