Jupiter is often called a planet of a ‘greater fortune’. It is the largest of all planets in the Solar System. It controls the liver, blood and thighs. Apart from being a benefic planet, Jupiter is also hot and moist. It symbolises expansion and optimism. The Sun sign associated with Jupiter is Sagittarius (and Pisces in traditional astrology, before the discovery of the outer Planets: Uranus, Neptune and Pluto).