Rashi on Deuteronomy
אשר לא צויתי [AND HATH GONE AND SERVED OTHER GODS … EITHER THE SUN, OR MOON, OR ANY OF THE HOST OF HEAVEN] WHICH I HAVE NOT COMMANDED to worship them (Megillah 9b).
Sforno on Deuteronomy
אלוהים אחרים, independent ones, having no relation to Hashem whatsoever, but disembodied beings. ולשמש או לירח, which are physical bodies;