The polar night is when it stays dark outside for more than twenty four hours. This occurs only inside the polar circles (the northernmost and southernmost areas on Earth).. A lot of times It will be a polar night for the winter and the opposite happens in the summer.
References[change | change source]
- Burn, Chris. The Polar Night. The Aurora Research Institute. http://nwtresearch.com/sites/default/files/the-polar-night.pdf. Retrieved 28 September 2015.
Other websites[change | change source]
- The polar night and polar darkness
- 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.