وَسَخَّرَ لَـكُمُ الشَّمۡسَ وَالۡقَمَرَ دَآٮِٕبَيۡنِۚ وَسَخَّرَ لَـكُمُ الَّيۡلَ وَالنَّهَارَۚ
And for your benefit He has subjected the sun and the moon (to a regular system); they keep rotating (in their respective orbits). And He has also subdued the night and the day (to a system) for your (system of life).