The Astronomical Observatories of Jai Singh c6.s1.t1.9

c6.s1.t1.9

² In the diagram *NL*=*SL*=φ, the latitude of the place, and *El*₁ cuts the meridian line *NS* in the nadir *n*. The horizon is graduated by joining the zenith *Z*, and the graduations on the equator, and each azimuth circle passes through the zenith, nadir and the point on the horizon to which it pertains, while the centres of the azimuth circles lie on the line parallel to *EW* and bisecting *Zn*.