Essay on the Architecture of the Hindus c4.56

c4.56

Another rule for finding the true points is given in the *Súrya Sid'dhánta*. "But, in consequence of the processional variation of the times of the shadow marked in the east and west of the circle, the difference in the sine of the declination between those times, being multiplied by the hypothenuse of the shadow at either of those times, and the product divided by the cosine of the latitude, the quotient will give the *angulas*; remove the western point so many *angulas* in the opposite quarter of the sun's declination, and the eastern point will become due east; or else, according as the sun is in the northern or southern solstice, the eastern point may be removed the same distance in that direction."