וַיַּ֣עַשׂ אֱלֹהִ֔ים אֶת־שְׁנֵ֥י הַמְּאֹרֹ֖ת הַגְּדֹלִ֑ים אֶת־הַמָּא֤וֹר הַגָּדֹל֙ לְמֶמְשֶׁ֣לֶת הַיּ֔וֹם וְאֶת־הַמָּא֤וֹר הַקָּטֹן֙ לְמֶמְשֶׁ֣לֶת הַלַּ֔יְלָה וְאֵ֖ת הַכּוֹכָבִֽים׃
Und Gott machte die beiden großen Lichtkörper, den größeren zur Herrschaft des Tages, und den kleineren zur Herrschaft der Nacht, und die Sterne.
Rashi on Genesis
המאורות הגדולים THE GREAT LUMINARIES — They were created of equal size, but that of the moon was diminished because she complained and said, “It is impossible for two kings to make use of one crown” (Chullin 60b).
Sforno on Genesis
ויעש...ויתן...להאיר...ולמשול..ולהבדיל..כי טוב, all of these expressions refer to the luminaries and the other stars. The Torah first writes: ויעש, seeing that up until that point sun and moon had simply been part of all the other celestial bodies which had been created on the second day, or of “heaven,” whose creation had already been reported in verse 1. This is the reason why at this stage the Torah does not call the development of these luminaries an act of creation, ויברא or something similar, but merely writes ויעש, which describes the completion of a process that had already been begun previously. At this stage, G’d singled out these two luminaries from among all the planets and assigned them their function