Equatorial Dial Brass equatorial dial, dated 1753 and signed “Ali el-Muvakkit Ebul- Feth”. Like astrolobes and quadrants, these instruments were used in everyday life to determine time –and thus prayer hours– and also to find the positions of celestial bodies. On loan from the Bosphorus University Kandilli Observatory. H: 20 cm Ø: 30.5 cm