Question

why Greenland is called mid Night Sun

Answer 1

Midnight Sun occurs in places north to Arctic Circle. So, any place above the Arctic Circle will be referred as Land of Midnight Sun. Here, Sun is visible for 24 hrs. Greenland is also above Arctic Circle.Thus,it is known as the land of midnight sun.

Answer 2

midnight sun occurs in the places north to Arctic circle.so,any place above the Arctic circle will be referred as land of the mid night Sun