COMMENTARY on 41:12
Mustafa Khattab:

Translation:
So He formed the heaven into seven heavens in two Days, assigning to each its mandate. And We adorned the lowest heaven with ˹stars like˺ lamps ˹for beauty˺ and for protection. That is the design of the Almighty, All-Knowing.”2 
Commentary:
2   See footnote for 7:54.

 

A. Yusuf Ali:

Translation:
So He completed them as seven firmaments in two Days, 4477 and He assigned to each heaven its duty and command. And We adorned the lower heaven with lights, and (provided it) 4478 with guard. Such is the Decree of (Him) the Exalted in Might, Full of Knowledge.
Commentary:

4477  For "Days", which may include thousands of years, see 7:54 , and n. 1031. They refer to stages in the evolution of physical nature. In the Biblical cosmogony, (Gen. 1, and 2:1-7), which reflects old Babylonian cosmogony, the scheme is apparently to be taken literally as to days and is as follows: the first day Allah created light; the second, the firmament; the third, the earth and vegetation; the fourth, the stars and planets; the fifth, fish and fowl from the sea; and the sixth, cattle, creeping things, beasts on land, and man; on the seventh day He ended His work and rested. Our scheme is wholly different. (1) Allah did not rest, and never rests. "His Throne doth extend over the heavens and the earth, and He feeleth no fatigue in guarding and preserving them"; (2) Allah's work has not ended; His activity still goes on 32:5; 7:54; (3) man in our scheme does not come in with land animals; his advent is much later; (4) our stages are not sharply divided from each other, as in the above scheme, where the stars and planets having been created on the fourth day, it is not intelligible how the first three days were counted, nor how vegetation grew on the third day. Our stages for earth and heavens are not in sequence of time for the heavens and the earth. Our six stages are broadly speaking, (1) the throwing off of our planet from cosmic matter; (2) its cooling and condensing; (3) and (4) the growth of vegetable and animal life; (5) and (6) the parallel growth of the starry realm and our solar system.

4478  Cf. 15:17 , and n. 1951; also 37:6-9. The transition from the third person ("He completed," etc.) to the first person ("We adorned."etc.) may be noted. The act of creation is an impersonal act: the act of adornment and guarding is a personal favour to Allah's creatures.

 

Muhammad Asad:

Translation:
And He [it is who] decreed that they become seven heavens 14 in two aeons, and imparted unto each heaven its function. And We adorned the skies nearest to the earth with lights, and made them secure: 15 such is the ordaining of the Almighty, the All-Knowing.
Commentary:
14  I.e., a multiplicity of cosmic systems (cf. note 20 on 2:29 ).
15  Cf. 15:16-18 and the corresponding note 16 and 17; also 37:6 ff.