Work done by Sawai Jai Singh:
Sawai Jai Singh has spent most of his time outside the kingdom in military campaigns, mughal politics and in stopping the expansion of Maratha in Malwa.In the history of Rajasthan, Sawai Jai Singh is known as a great ruler, army chief, scholar, shelter provider, and an expert of mathematics as well as movements of stars & planets (astrology). Sawai Jai Singh had got an accurate table d'eveloped for the counting of the speed of planets and stars.Many books were written during his period such as Jai Singh Karika’ book was based on astrology and ‘Siddhant Samrat’, ‘Yantra Raj’ were based on astrological instruments.Sawai Jai Singh got built five observatories for the study of astrology, these are situated in Jaipur, Delhi, Mathura, Banaras and Ujjain.