The Astronomical Observatories of Jai Singh c9.3

c9.3

Hunter states that Jai Singh himself devised the Samrāṭ Yantra, the Jai Prakāś, and the Rām Yantra. These three instruments are indeed peculiar to Jai Singh’s observatories, and must be to some extent attributed to Jai Singh’s personal ingenuity.² Jai Singh used other stone instruments, such as the mural quadrant and cylindrical dial; but these were not mentioned specially in the preface, because they were common to many observatories. They are, however, mentioned in Jagannāth’s introduction to the Samrāṭ Siddhānta (see page 3).