Signs in the Subjection of Night and Day, the Sun and the Moon, and in that which grows on Earth

Allah mentions the mighty signs and immense blessings to be found in His subjection of night and day, which follow one another; the sun and moon, which revolve; the stars, both fixed and moving through the skies, offering light by which people may find their way in the darkness. Each of (these heavenly bodies) travels in its own orbit, which Allah has ordained for it, and travels in the manner prescribed for it, without deviating in any way. All of them are under His subjugation, His control and His decree, as Allah says:

إِنَّ رَبَّكُمُ اللَّهُ الَّذِى خَلَقَ السَمَـوَتِ وَالاٌّرْضَ فِي سِتَّةِ أَيَّامٍ ثُمَّ اسْتَوَى عَلَى الْعَرْشِ يُغْشِى الَّيْلَ النَّهَارَ يَطْلُبُهُ حَثِيثًا وَالشَّمْسَ وَالْقَمَرَ وَالنُّجُومَ مُسَخَّرَتٍ بِأَمْرِهِ أَلاَ لَهُ الْخَلْقُ وَالاٌّمْرُ تَبَارَكَ اللَّهُ رَبُّ الْعَـلَمِينَ

Before we move to the next verse, let us clarify the first sentence of verse 12: سَخَّرَ‌ لَكُمُ اللَّيْلَ وَالنَّهَارَ‌ (And He has subjugated for you the day and the night). Here, 'subjugating the day and the night' means that Allah made them subservient to His command in order that they can serve man, pursuant to which the night brings comfort to him and the day smooths out the avenues of his work. 'Subjugating them' never means that the day and the night start alternating under human command.