The Astronomical Observatories of Jai Singh c15.s1.t4.9

c15.s1.t4.9

The corrections for epicycles are simple proportions: the difference for 90° is Δ, what is the difference for θ degrees? The dimensions of the epicycle are expressed in degrees, etc., in such a way that (r' being the radius of the epicycle) 2 π r' : 2 π :: the number of degrees : 360.