76 THE SOLAR ECLIPSE [CH. V A rule relating to the determination of the celestial latitude from the tropical longitude of the meridian ecliptic point obtain- ed by the above rule : 4(ii). From that (tropical longitude of the meridian ecliptic point) diminished by the longitude of the Moon's ascending node calculate the celestial latitude, north or south, (as in the case of the Moon). A rule relating to the determination of the drkksepa for the time of geocentric conjunction of the Sun and Moon : 5-7(i). Take the sum of the declination of the meridian ecliptic point and the celestial latitude (calculated from the tropical longitude of the meridian ecliptic point), and of the (local) lati- tude when they are of like directions and the difference when they are of unlike directions, the direction of the remainder (in the latter case) being that of the minuend. (The Rsine of the sum or difference is) the madhyajya. By that multiply the Rsine of the bhuja of the tropical longitude of the rising point of the eclip- tic and divide (the product) by the (local) divisor (defined in stanza 1). Square whatever is thus obtained and subtract that from the square of the madhyajya. The remainder is the square of the Rsine of the drkksepa. A rule relating to the determination of the drggatijya for the time of geocentric conjunction : 7-(ii)-8(i). Having added that (square of the dikksepajya) to the square of the Rsine of the instantaneous altitude (of the Sun), subtract that from the square of the radius : (the result is the square of the drggafijya). The drkksepajya and drggatijya obtained above, are neither precisely those for the Sun nor those for the Moon. 2 They would have been for the Sun, had the author not taken into account the celestial latitude calculated » MBh, v. 14. 2 The Sun's drkksepajya is the Rsine of the zenith distance of that point of the ecliptic which is at the shortest distance from the zenith; and the Sun's drggatijya is the distance of the zenith from the plane of the secondary to the ecliptic passing through the Sun. (Contd. on the next page footnote)
