The Astronomical Observatories of Jai Singh c15.s2.t1.11

c15.s2.t1.11

(7) A large azimuth circle fixed on a pillar, traversed by two diameters directed to the four points of the compass. At the centre were fixed two vertical quadrants, furnished with alhidades, so that the altitudes and azimuths of two stars could be taken simultaneously.²