In astrology, a trine is an astrological aspect formed when a planet, point, or other celestial body is 120 degrees away from another planet, point or celestial body. The allowable orb for a trine is 8 degrees, so any planet that is anywhere from 112 degrees to 128 degrees to be considered a trine.
Trines are considered to be highly beneficial aspects, instilling fortune on those individuals who have them in their natal or progressed horoscopes. The reason for this is because there is a natural and free flow of energy between one planet to another.
Astrologers tend to think that the trine gives such a free flow of energy to the person who is fortunate enough to have one that he may stop trying: in such a case, a trine would be considered to pose more of a negative influence than a positive.