Polar night
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 circles (the northernmost and southernmost areas on Earth).[1] A lot of times It will be a polar night for the winter and the opposite happens in the summer.
Polar Night Media
Civil polar twilight in Ruka, Finland at noon in December
Civil polar twilight on Nordkinn Peninsula in Norway, mainland Europe's northernmost peninsula.
At Earth's poles the Sun appears at the horizon only and all day around equinox, marking the change between the half year long polar night and polar day. The picture shows the South Pole right before March equinox, with the Sun appearing through refraction despite being still below the horizon.
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References
- ↑ Burn, Chris. The Polar Night (PDF). The Aurora Research Institute. Retrieved 28 September 2015.
Other websites
- 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.
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