وَأَغْطَشَ لَيْلَهَا وَأَخْرَجَ ضُحَاهَا (29)
(79:29) and covered its night with darkness and brought forth from it its day; *15
*15) The night and the day have been attributed to the heaven, for the night falls when the sun of the heavens sets and the day dawns when it rises. The word "cover" has been used for the night in the sense that after the sun has set the darkness of the night so spreads over the earth as though it has covered it from above by a curtain.