Ujjain was the hub of all activities of Hindu astronomers and astrologers from ancient times, which paved the way for establishment of an observatory in the 17th century. Vedh Shala was built by Maharaja Jai Singh between 1725 and 1730. It is a masterpiece and an excellent work of art. The shala possesses instruments that are used to determine the locations of heavenly bodies for astrological purposes. The other things available here are a small planetarium and a telescope for the purpose of moon-gazing and observing the planets Mars and Jupiter and their satellites. The Vedh Shala in Ujjain is a bit smaller than those in Jaipur and Delhi, but is quite interesting and very much in use.