About

Nordic Daylight started as a small tool for planning hikes and photo trips in Denmark, Norway and Iceland, where the length of the day changes faster than most people expect: in Tromsø the day grows by more than half an hour per week in February.

Everything is computed in your browser from the date and the coordinates, using the standard low-precision solar position formulas. The results are accurate to about a minute, which is better than the effect of terrain, refraction on a cold day, or a mountain on the horizon.

What the numbers mean

Sunrise and sunset are the moments the upper edge of the sun touches a flat horizon. Civil twilight lasts while the sun is less than 6° below the horizon: there is still enough light to be outdoors without a lamp. Golden hour here is the time when the sun is lower than 6° above the horizon before sunset.

North of the Arctic Circle the sun can stay up all day around midsummer (midnight sun) or stay below the horizon around midwinter (polar night). The calculator shows both.