Astrology has no power of predictionIn the book of Daniel, the Bible makes fun of astrologers and indicates that they are powerless to really observe the future. King Nebuchadnezzar of Babylon had a disturbing dream that none of his astrologers or "wise men" could interpret.2 The King had ordered all the wise men, including Daniel, a young captive from Judah, to be executed. Daniel convinced the king's bodyguard that God would reveal the mystery to him and requested time to seek the answer. Having prayed to God and received the answer in a vision, Daniel reported to the king's chambers. Daniel told King Nebuchadnezzar:
Daniel answered in the presence of the king, and said, The secret which the king hath demanded cannot the wise men, the astrologers, the magicians, the soothsayers, show unto the king; but there is a God in heaven who reveals mysteries. He has shown King Nebuchadnezzar what will happen in days to come. Your dream and the visions that passed through your mind as you lay on your bed are these... (Daniel 2:27-28)
Later, when King Belshazzar, Nebuchadnezzar's son, saw a finger appear and write on the wall at his party, he called in the astrologers, who, likewise, failed to interpret a writing that had appeared on the wall.3 These astrologers were again shown to be powerless deceivers.
God commanded His people, the nation of Israel, not to practice astrology by looking at "signs of the heavens." God calls such "signs" delusions:
Thus says the Lord, "Do not learn the way of the nations, And do not be terrified by the signs of the heavens Although the nations are terrified by them; For the customs of the peoples are delusion... (Jeremiah 10:2-3)