In 2 Kings 17:10 there is a reference to the old high-place worship, which was professedly a worship of Yahweh, but with unauthorized rites and emblems; here the reference is to Ahab’s setting up a grove to Baal in the city of Samaria (marginal reference).
And worshipped all the host of heaven - Astral worship has not hitherto been mentioned as practiced by the Israelites. Moses had warned against it Deuteronomy 4:19; Deuteronomy 17:3, so that it no doubt existed in his day, either among the Canaanite nations or among the Arabians Job 31:26-28. Perhaps it was involved to some extent in the Baal worship of the Phoenicians, for Baal and Astarte were probably associated in the minds of their worshippers with the Sun and moon. Later in the history we shall find a very decided and well-developed astral worship prevalent among the Jews, which is probably Assyro-Babylonian (2 Kings 21:3 note).