It is God who alternates night and day. There is surely a lesson in this for men of sight.
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (allah causeth the revolution of the day and the night) he takes away the night and brings in its stead the day and takes away the day and brings in its stead the night; this is what is meant by their revolution. (lo! herein) in the alternation of day and night which i have mentioned (is indeed a lesson) a sign (for those who see) in relation to matters of religion; it is also said that this means: those who see with their eyes.
Jalāl al-Dīn al-Maḥallī
تفسير : god alternates the night and the day, that is, he brings one in place of the other. surely in that, alternation, there is a lesson, an indication, for those who see, those possessing insight, [an indication] of god’s power, exalted be he.