पृष्ठम्:चन्द्रछायागणितम्.djvu/२८

COMPUTATIONS CONCERNING MOON'S SHADOW By NILAKANTHA SOMAYAJl I. COMPUTATION OF SHADOW FROM TIME (Introduction) 1. Let the Moon's Shadow (prabha) 1 be computed after determining the true sun and moon, the moon's apogee and ascending node, the ayanamsa 2 at the time and the latitude of the place (for which the computation is made). (The Moon's True Latitude) 2. The R 3 sine of the 'true moon-wmws-ascending node" multiplied by 270 and divided by the 'Last Hypotenuse', is the true latitude of the moon. It is north or south, (respectively, for the first two quadrants and the last two quadrants). The square root of lits square subtracted from R 2 J, is the 'perpendicular' (koti). 1. Prabha is used in the sense of 'shadow' on account of the equivalence between their measure. 2. Ayanamsa is the distance of the Vernal equinox-point from the first point of the Indian Zodiac, /. e., the First point of the sign Mesa. 3. R^fa^i of 3438 units.