Star Signs arent a belief system.
I didnt say they were. I said the whole SCIENCE of astrology is an instrument to divine one's personal makeup and maybe allow them to fill in a few gaps in their lives.
Its just what some writers made up.
Correct. by trial and error. Over...about 5,000 years? If it was a farce it wouldn't still be around.
Most horoscopes you read are simply take into account the sun sign, which is barely 10% of what is actually going on. To work it out properly you need to know pretty much what sign every planet was in. For this you need the exact time and place of the birth, a full chart of retrogrades for that particular year and a great head for numbers or a good astronomy program.
And even then the interpretation really lies with the Astrologer.
Mercury in Aquarius might mean different things to different people (usually not, but still..)
Its a hugely complex system that is an excellent way to catalogue human personalities, even if nothing else.