Translation:

54. Your guardian-Lord is Allah Who created the heavens and the earth in six days and is firmly established on the throne (of authority): He draweth the night as a veil O'er the day each seeking the other in rapid succession: He created the sun the moon and the stars (all) governed by laws under His command. Is it not His to create and to govern? Blessed be Allah the cherisher and sustainer of the worlds!

Notes (Tafseer)

1031. A sublime verse, comparable to the Throne Verse ii. 255. As for the Creation in six days, in xxii. 47, we are told that a Day in the sight of Allah is like a thousand years of our reckoning, and in lxx. 4, the comparison is with 50,000 of our years. In the history of our material earth, we may reckon six great epochs of evolution.

1032. Here, we are told of the creation of the heavens and the earth in six days. But lest we should be obsessed with the Jewish idea that Allah rested on the seventh day, we are told that the Creation was but a prelude to Allah's work: for His authority is exercised constantly by the laws which He establishes and enforces in all parts of His Creation. The beautiful imagery of night and day seeking out each other in rapid succession is still further enforced in the Arabic by the double accusative of the verb yugshi, showing the mutual interactions of the day and the night, each covering the other in turn. The heavenly bodies show an order which is evidence of His constant care and government. Not only that, but it is only He Who creates, maintains, and governs, and no one else.