In the polar regions, there is a dramatic seasonal variation in the lengths of day and night.
Summer days are very long and summer nights, very short, and visa versa in the winter.
This effect becomes more pronounced as you approach the pole, and can be observed across the state of Alaska. In the southern parts of Alaska, for example, around Juneau, the longest days are 18 hours long. Summer days are even longer inside the Arctic Circle. Sky Publishing Corp. All rights reserved. Please read our copyright and permissions policy .