The Astronomical Observatories of Jai Singh c12.15

c12.15

52. There appear to be no records of any astronomical instruments at Ujjain, earlier than those installed by Jai Singh. The date of the construction of his observatory is uncertain, but it was probably between A.D. 1728 and A.D. 1734 (see page 139). There is no record as to whether, or not, the instruments were ever used for actual systematic observation, but we know that, before the end of the eighteenth century, they had ceased to be so used.