- head twice every year. At all places along the equator
the sun is overhead at noon on the 21st of March. Each day after, it comes overhead at noon at places farther north, until the 21st of June, when it is overhead at the tropic of Cancer. After this the sun appears to turn and go south, and on September 22 it is again overhead at noon at the equator. The sun then continues to move southward each day until December 21, when it is overhead at the tropic of Capricorn. And so it goes back and forth the year round.
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Daily Motion of the Heavens as seen at the North Pole.
While the sun is north of the equator, there is constant day somewhere within the Arctic circle; when the sun is south of the equator, there is constant night somewhere within the Arctic circle. The farther a region is from the equator, the longer are the days and nights at different seasons of the year. At the pole there is a night of six months and a day of six months. The night is sometimes lighted by the moon and sometimes by the aurora borealis.
There are but two seasons in the Arctic regions—a
