The Astronomical Observatories of Jai Singh c6.s1.5

c6.s1.5

(i) The containing disc is termed the *mater*² (Ar. *umm*) and the inner part of this is the *venter*,³ while the raised edge is called the *kuffa* or rim.⁴ The *venter* is often inscribed with latitudes and longitudes of important cities. (Figures 13, 14, 15.)