Astrology is the study of the movements and relative positions of celestial objects as a means of divining information about human affairs and terrestrial events.
I understand where people are coming from with this one because honestly, this is a difficult subject to debunk fully using only scripture. It turns out that the Bible actually does contain many references to astrological phenomena, and even states in some places that the stars and other heavenly bodies will show signs of the end approaching. So how bad can read your horoscope possibly be? Remember that God knows all and that there is a lot that we do not need to know. Another thing you should remember is that God commands that you rely on him alone for your faith and that relying on or putting your trust in anything else is a sin.
Exodus 20:3-5 “You shall have no other gods before me. You shall not make for yourself a carved image or any likeness of anything that is in heaven above or that is on the earth beneath or that is in the water below. You shall not bow down to them or serve them, for I, the Lord, your God, am a jealous God…
Speculation can lead to any determination about anything, and I strongly discourage “interpreting” the Bible. The Bible specifically condemns people who practice astrology. At the same time, as an unrelated note, you also get to see a sense of personality in God as he shows a hint of sarcasm in the tone of this condemnation. The condemnation is very clear that astrology is useless and sinful.
Isaiah 47:13-14 “You are tired out from listening to so much advice. Let them take their stand – the ones who see omens in the sky, who gaze at the stars, who make monthly predictions – let them rescue you from the disaster that is about to overtake you! Look, they are like straw, which the fire burns up; they cannot rescue themselves from the heat of the flames. There are no coals to warm them, no firelight to enjoy.”
Deuteronomy 4:19“When you look up to the sky and see the sun, moon, and stars – the whole heavenly creation – you must not be seduced to worship and serve them, for the Lord your God has assigned them to all the people of the world.”
Where the Bible states that the stars are to be used for signs, it is talking about navigation. The stars can be used as signs that you are traveling in the right direction or with the current time tell you where you are located. These are all of the key topics to cover in Scripture, however, there are plenty of scientific resources you may use to debunk the use of horoscopes.
In conclusion, although astrology is referenced in scripture it is never in a good light, the theme is always that putting your faith in something is a form of worship. In saying that you know today will be either a good or a bad day because of signs from the stars or other bodies, you are putting your faith in and worshiping the stars. This is shown in scripture to be not only foolish but evil. You are to worship none other than the one true Lord.