Astro Uncle today will tell you how guru or planet Jupitor. Jupiter, also known as Guru is considered to be one of the most benefic planets in astrology. It is the largest planet in the solar system, and is nearest in comparison with the Sun in regard to its size. It takes around 12 years to revolve around the Sun, which in other words also means that it remains in each zodiac sign for one year approximately, according to transit or Gochar.