Комментарий к Ийова 38:20

At different times, parts of the Earth are in the light and others in darkness. Malbim identifies two such cycles: The first is that which occurs in the Arctic and Antarctic (the Earth's limits), namely, that when it is light round the clock (summer) in the one it is night round the clock (winter) in the other;

The second is the variation in the length of the day that follows the sun's passage through the Houses of the Zodiac.