A determining factor believed by some to affect individual tendencies and characteristics understood to be caused by the positions of the stars and planets at theFactors believed to be caused by the changing positions of the stars and planets in relation to their positions at the time of one's birth time of one's birth, the effect of one thing (or person) on another, verb_ have and exert influence or effect, shape or influence; give direction to, transitive verb_ To have an influence on (something); change, To change the behavior or thinking of (someone); sway, intransitive verb_ To exert, make use of one's influence