My guess is, that hardly anybody believes in horoscopes - at least not openly.
Don't find horoscopes relevant, but the Zodiac had huge significance in ancient cosmologies, and there is a crapton of customs that survive even to this day that are related to them.
Ever notice how the Lunar, Stellar, and Solar year almost correspond with each other? These relationships are the source of many current traditions, from Christmas, to Easter, Halloween, and even the figure of Harlequin from Italian comedy.
Other cosmologically inspired customs that have survived to the modern era in various forms include:
- Throwing coins into fountains and making wishes (water sacrifice)
- Execution by hanging (sky sacrifce)
- Burials (going to the Earth Mother)
- Cremation (going to the Sky Father)
- Witches riding broom sticks (a fertility thing. I'm guessing J.K. Rowlings was unaware what the broom stick signifies when she wrote Harry Potter...)
- May Poles (the World Axis)
- Domesticated animals being bred to be black (significant to the Earth Mother) or white (the Sky Father).
- Both parties spitting in their hands and shaking to seal a deal/oath (mixing of bodily fluids having mystic significance related to the spirit/soul. Cross-peeing, the mixing of blood, and even sexual intercourse having similar mystic/religious significance).
- The Stork bringing babies.
- Bull fights (the killing of Taurus the sky bull, i.e. early Bronze Age Stellar New Year)
- The Bulls' Eye imitates patterns painted on the forehead of sacrifical bulls.
- Also the carnival strongman game where you attempt to kill the aforementioned sacrifical bull (ring the little bell) in a single stroke.
- Church Bells. (The Celtic Cauldron was a mini-representation of the cosmos, and made a fine sound when you struck it. Introduced to Christianity by former Irish Druids after their conversion to Christianity.)
This stuff is everywhere if you know how to look...