Zephaniah 1:2-7
2 “I will sweep away everything from the face of the earth,” declares the Lord. 3 “I will sweep away both man and beast; I will sweep away the birds in the sky and the fish in the sea— and the idols that cause the wicked to stumble.”
“When I destroy all mankind on the face of the earth,” declares the Lord, 4 “I will stretch out my hand against Judah and against all who live in Jerusalem. I will destroy every remnant of Baal worship in this place, the very names of the idolatrous priests— 5 those who bow down on the roofs to worship the starry host, those who bow down and swear by the Lord and who also swear by Molek, 6 those who turn back from following the Lord and neither seek the Lord nor inquire of him.”
7 Be silent before the Sovereign Lord, for the day of the Lord is near. The Lord has prepared a sacrifice; he has consecrated those he has invited.
I personally interpret that as instructions not to over- rely on astrologers, which we could also say applies to any material science. But Luke 21:25 implies that studying the stars will allow one to see the signs. There's also the magi, who were not led astray by following the star. A person who surrenders their discernment to an astrologer is just as foolish as one who surrenders it to a doctor; that doesn't mean one shouldn't observe, nor that they should fail to use the talents that one has been given. All things in moderation, and of course under God. This friend believes that God gave him a talent for reading heavenly signs, and I have seen nothing in his life to indicate otherwise. Blessings.
Astronomy maybe. Gen 1 is setting calenders for dates and times for festivals and of course the Lords birth. Astrology is a pagan cult out of Babylon.