The Astronomical Observatories of Jai Singh c6.s1.25

c6.s1.25

The sighter and graduated circle (fig. 7) on the back of the astrolabe form the part of the instrument used in actual observation; while the ‘tablets’ and the ‘ankabūt (which rotates) and the graduated circle on the raised edge (kuffa) of the mater form a very efficient calculating machine.