Where in the bible does it say god did not approve of astrology?

Answer 1

II Chronicles 33:6 "He made his sons pass through the fire in the valley of Ben-hinnom; and he practiced witchcraft, used divination, practiced sorcery and dealt with mediums and spiritists. He did much evil in the sight of the LORD, provoking Him to anger."

Most astrologers would liken themselves to a medium or spiritist, as they seek information that is not known on the earth.

Deuteronomy 18:10&11 "There shall not be found among you anyone who makes his son or his daughter pass through the fire, one who uses divination, one who practices witchcraft, or one who interprets omens, or a sorcerer, or one who casts a spell, or a medium, or a spiritist, or one who calls up the dead."

Most astrologers would admit to divination and definitely would admit to interpretting omens.

II Kings 5:6 "He made his son pass through the fire, practiced witchcraft and used divination, and dealt with mediums and spiritists. He did much evil in the sight of the LORD provoking Him to anger."

As you see, each time spiritists or mediums or divination is used it "provokes God to anger".