Yunus Ayah 5

هُوَ ٱلَّذِى جَعَلَ ٱلشَّمْسَ ضِيَآءً وَٱلْقَمَرَ نُورًا وَقَدَّرَهُۥ مَنَازِلَ لِتَعْلَمُواْ عَدَدَ ٱلسِّنِينَ وَٱلْحِسَابَ‌ۚ مَا خَلَقَ ٱللَّهُ ذَٲلِكَ إِلَّا بِٱلْحَقِّ‌ۚ يُفَصِّلُ ٱلْأَيَـٰتِ لِقَوْمٍ يَعْلَمُونَ ٥ He is the One Who made the sun a radiant source and the moon a reflected light, with precisely ordained phases, so that you may know the number of years and calculation ?of time?. Allah did not create all this except for a purpose. He makes the signs clear for people of knowledge.