Here are the most commonly cited aspects in astrology and the mathematical angle they represent: Opposition: 180 degrees apart Trine: 120 degrees apart Square: 90 degrees apart Sextile: 60 degrees apart Conjunction: 0 degrees apart Again, it's a geocentric map. A square is two heavenly bodies at a 90 degree angle as seen from earth. I fundamentally do not agree with classifications of "good" influences and "bad" influences in traditional astrology. Traditionally, a square and an opposition are bad influences. I find it more useful to think of them as high energy aspects. Charts with no oppositions or squares are "losers" who go nowhere. Too many of them and you have a drama queen unlikely to get their act together. Trines are traditionally seen as "good" aspects. It's more accurate to think of them as stable harmonics. Keep in mind you can bring a bridge down with harmonics of that sort. If it matches up the right way, the motion a...
A Critique of Astrology