The Astronomical Observatories of Jai Singh c9.s1.31

c9.s1.31

33. The Dakshinovritti Yantra (‘Meridian circle’) is like the mural quadrants found in most mediaeval observatories. It consists, essentially, of a wall in the meridian, and on the wall are two graduated quadrants and centre pins (see figures 56 and 62 and plates XXIV and XXVI), which were used for observing the altitudes of heavenly bodies when passing the meridian. The instrument corresponds to the modern transit circle. Originally there was one at each observatory, but that at Delhi has been destroyed.