mP,
1. You contradicted my (and Phizzy's) statement that it is astrology JWs are warned about, not astronomy. You've gone off on tangents about JWs being hypocrites, Josephus and the Temple, the Jews and the Bible and your view that the latter condones the practice of astrology (it doesn't). None of this has anything to do with the fact that JWs are warned about astrology rather than astronomy.
2. You assert that Hannukah is all about the winter solstice and the rebirth of the Sun. It isn't. As you were shown, the festival stems from something else entirely and, unlike the equinoxes and solstices, which occur on (practically) the same date in the luni-solar calendar every year, Hannukah doesn't, sometimes beginning as early as November. The Jews know about the origins of their own festivals and why they celebrate them, so it's really inconsequential that you disbelieve their reasons.
All cultures monitor the passing of the seasons, especially agricultural peoples like the ancient Israelites - times for planting and harvest, and the rainy and dry seasons. The appearance of certain stars and constellations at different times of the year are markers for those seasons. As was argued in a previous post, one thing the OT is consistent on - there is one Creator of all things; He alone is to be revered and worshipped; He doesn't take kindly to those who look for spiritual guidance (divination, using other deities) outside of what He has prescribed.