A. Astrology Is False Prophecy.
By definition, astrology attempts to predict the future. Are its predictions accurate?
Astrology is unreliable.
Daniel 4:7; (2:10,11; 5:7,8) - On three occasions astrologers and other occult experts were asked to predict the future. Each time they failed, but Daniel succeeded by God's power.
[Note: "Enchanters" in ASV = "astrologers" in KJV. "Chaldeans" in ASV is "astrologers" in NIV.]
God forbids His people to place serious confidence in astrology.
Deuteronomy 18:9-14,18-22 - Occult practices, including divination, are an abomination to God. V14 specifically forbids listening to diviners. "Divining" is attempting to predict the future by occult or mystical methods. But astrology is part of the occult and attempts to predict the future. So by definition, astrology constitutes occult divination, which God forbids (note again the Britannica definition above).
Vv 21,22 - If one claims to know the future, but his predictions do not come true, do not fear him! The Bible shows that astrologers cannot predict the future with certainty, and most astrologers will admit their predictions are often incorrect.
2 Kings 17:16-18 - God destroyed Israel for practicing idolatry, worshiping "the host of heaven" (stars and planets), using "divination" [ASV; cf. "witchcraft and soothsaying" in NKJV], and other occult practices.
Jeremiah 10:2 - God's people were expressly forbidden to be concerned about the "signs of heaven," that heathen people trusted in. This clearly includes astrology. God's people were not to learn their ways!
The Old Testament clearly says that the future cannot be predicted accurately by the stars. If it could not be done then, it cannot be done now. To place trust in such methods is to learn the ways of the heathen, which is just as wrong now as it was then.
[Ezek. 21:21; 12:24; 13:6-9,23; 21:29; 22:28; Isaiah 44:24,25; Acts 16:16-19; Jer. 27:9,10; 14:14; Mic. 3:6-11; Zech. 10:2]
B. Astrology Is a False Standard of Guidance.
Astrology attempts to advise people how to act, based on the position of the stars, etc. So people "trust their lucky stars" and "thank their lucky stars." They seek guidance from some Occult source other than God.
Isaiah 47:13,14 - Babylon originated astrology. God promised to destroy Babylon, then asked what the astrologers, stargazers, and monthly prognosticators would do to stop Him. All these were involved in astrology, but they were powerless against God.
Daniel 1:19,20 - Daniel and friends were ten times better in giving wisdom and guidance than all the Babylonian magicians and astrologers ["enchanters" - ASV].
Deuteronomy 18:15,18-20 - Having forbidden the occult (including astrology) (vv 9-14), God predicted a spokesman like Moses whom we should listen to. This refers to Jesus (Acts 3:22,23). One who speaks differently from His message should die.
The teachings of Jesus provide all things that pertain to life and godliness (2 Peter 1:3) and every good work (2 Timothy 3:16,17). What do we need astrology for? Bible writers reveal true wisdom to guide your life. Astrologers may occasionally guess right, but the Bible is always right. Yet some people will read their horoscope everyday, but will go days without opening the Bible!
The sun, moon, and stars are lifeless, unintelligent objects. They can no more tell what your future holds or how to live you life than a rock or mud puddle can! If you want real wisdom, go to the all-wise, all-powerful Creator who made the sun, moon, and stars!
[Prov. 3:5,6; Acts 17:28; Matt. 11:28; 6:25-34; Rom. 8:28]
C. Astrology Is a Form of Idolatry.
Astrology originally involved direct worship of heavenly bodies.
Deuteronomy 4:15-19 - God warns His people not to worship idols, including the sun, moon, and stars - called the "host of heaven."
2 Kings 21:1-3 - The evil king Manasseh practiced idolatry, worshiped the host of heaven, and otherwise participated in the Occult (v6).
2 Kings 23:5 - When Josiah became king, he removed idolatry, including worship of the sun, moon, the constellations, and host of heaven. "Constellations" (NKJV) = "the Zodiac" (NKJV footnote; cf. Gesenius) or the "12 signs" (ASV footnote).
Astrology from its very beginning was a form of idolatry forbidden by God.
[Deuteronomy 17:2-5; Amos 5:25,26; Acts 7:42,43; Deut. 13:1-5; Jer. 19:13; Zeph. 1:5]
Astrology today still substitutes heavenly bodies for God.
It is possible to practice idolatry without intentionally performing worship rituals. Coveting, for example, is idolatry (Eph. 5:5; Col. 3:5). Idolatry is anything that puts created things in the position that only God should occupy.
The Bible teaches that no one but God can predict our future lives.
James 4:14 - Man does not know what will happen tomorrow.
Proverbs 27:1 - You don't know what a day may bring forth.
Daniel 2:27,28 - Astrologers could not interpret Nebuchadnezzar's dream (a prediction of the future), but God could do so.
Isaiah 41:21-23; 42:8,9 - God rests His claim to Deity on His ability to predict the future. He challenges idols to prove they are gods by telling the future.
If we believe the God of the Bible is the only true God, then we must conclude that stars cannot predict the future. To believe that stars can predict the future is to claim they have the power of gods! It puts the stars in place of God and gives the glory of God to others. Intentionally or not, that is a form of idolatry, which God forbids.
The Bible teaches that only God can give rules for moral and spiritual guidance of our lives.
Isaiah 8:19,20 - Do not seek occult teachers, but seek God. Where do you find His will? In the law and the testimony. When people teach us to seek spiritual guidance from sources other than God's word (as the occult does), there is no light in them.
Galatians 1:8,9 - Anyone who preaches a different gospel - a different spiritual source of guidance for our lives - is accursed. Why? Because they have assumed a position that only God can occupy.
"Astrology has evolved from the crude, ... superstitious worship of the planets to the present sophisticated, ... superstitious worship of the planets" - Raymond Harris.
Divine revelation is complete in Scripture (2 Tim. 3:16,17). Anytime we exalt a creature to a position only God can rightly occupy, we are guilty of idolatry.
[Isaiah 55:8,9; Rom. 1:25]
from: https://www.gospelway.com/religiousgroups/astrology.php