Jantar Mantar is a collection of architectural astronomical instruments, built by King Jai Singh II between 1727 and 1734, literally means “calculation instrument”. The Jaipur observatory has been inscribed on the World Heritage List as “an expression of the astronomical skills and cosmological concepts of the court of a scholarly prince at the end of the Mughal period”. The observatory consists of fourteen major geometric devices for measuring time, predicting eclipses and tracking stars’ location as the earth orbits around the sun. It is located next to the City Palace in Jaipur and is opened daily from 9AM to 4:30PM. The entry fee is 100 rupees for foreigners and 20 rupees for Indians.