Anthony Willingham, age 10, of Arcadia, Fla., for his question:

WHERE IS THE LAND OF THE MIDNIGHT SUN?

At certain times of the year, the sun shines at midnight in the polar regions. This happens in the Arctic Circle starting about June 21.

The northern part of Norway is called the Land of the Midnight Sun. There is continuous daylight from May through July. At the North Pole, the sun does not set for six months, from about March 20 to about Sept. 23.

At the Antarctic Circle, 24 hours of sunlight happen about Dec. 21, and the South Pole has midnight sun from about Sept. 23 to about March 20.

Midnight sun is caused by a tilting of the earth toward the sun. When one polar region is having continuous sunlight, the region facing the other way is having continuous darkness.