I am Aquarian and I do believe in Astrology. My Spiritual Teacher, a rare Soul in whom I have total Faith, teaches that Astrology is very valid.
However, not only him but other Spiritual Masters have also said that Grace is the last word. If the devottee is sincere and if he/she is blessed with a sincere Teacher, God, or the intervention of the Teacher himself can nullify the laws of Astrology. By Teacher I mean a Soul who has merged in God and God in him, like Christ or Buddha or Krishna, etc..