पृष्ठम्:महाभास्करीयम्.djvu/१८०

PROMINENT STARS OF THE NAKSATRAS shadow (of the gnomon) due to the Sun falls towards the south, the Sun's agra minus the Rsine of the Sun's meridian zenith distance is stated to be (the value of) the sankvagra. From that (samkvagra) determine the true value of the equinoctial midday shadow (of the gnomon),' and then calculate as before the lati- tude and colatitude (for the place). A rule for finding the longitude of an unknown planet with the help of (i) the longitude of a known planet and (ii) the difference between the times of rising or setting of the known and unknown planets: 95 60(ii)-61. Having correctly ascertained in terms of nāḍikās (i.e., ghatis) the difference between (the times of rising or setting or culmination of) the planets to be known and known, multiply those ghatis by six. Thus are obtained the degrees (of the difference between the longitudes of the two planets). By those degrees diminish or increase the longitude of the known planet according as it is to the east or west of the planet to be known. This is stated by the learned people well versed in planetary motions (to be the method for getting the the longitude of the planet to be known). This rule is approximate, as the inclinations of the orbits of the two planets to the ecliptic have been neglected and the ecliptic has been suppos- ed to rise above the horizon uniformly at the rate of six degrees per ghati (i.e., 15 degrees per hour). (2) JUNCTION-STARS OF THE ZODIACAL ASTERISMS AND CONJUNCTION OF PLANETS WITH THEM. Longitudes of the prominent stars of the naksatras: 62. In this way from (the known longitudes of) the planets or stars have been determined, at all places and at all times, the celestial longitudes of the (prominent) stars of the nakṣatras. The nakṣatras are the twenty-seven zodiacal asterisms. In the following table we give a few details regarding these nakṣatras. ¹ Vide supra stanza 55,