10:5 It was He that made the sun a brightness and the moon a light, and determined it in phases so that you might know the number of years and the reckoning. Allah did not create them except in truth, and distinguishes the verses to a nation who know.
10:6 In the alternation of the night and day, and in all that Allah has created in the heavens and the earth, surely there are signs for people who are cautious.