Planets & Their Significance-2 By: Siva Karthikeyan | Nov 21st 2007 - Astrology compatibility is the central focus of the Solar System .This system. This system primarily includes Sun and nine planets such as Mercury, Venus, Moon (a satellite of earth), Saturn, Uranus, Neptune and Pluto. We may conveniently ignore Uranus, Neptune and Pluto as their effect is negligible on human life Tags:Astrology, solar system and planets