17- AL-’ISRÂ’ The Night Journey Revealed at Makkah /
12. We made the night and the day two outward, visible signs. We effaced the light from the entity of the night. We made the day a visible entity for objects to be perceptible by the sense of sight in order to betake yourselves to Providence, for His bounty, and in order to know the number of the years. This is also to reckon the time occupied by the sun in its apparent passage through the zodiac and the period of the earth’s revolution round the sun, which form a natural unit of time so that you can compute time and determine it by reckoning. And everything did We expound and make plain and abounding in detail.