सिद्धान्तशिरोमणि: गणिताध्याय (भास्कराचार्य - ग्रहगणित, मध्यमाधिकार व स्पष्टाधिकार सटीक)

59 The number of the elapsed solar years multiplied by the number of sidereal revolutions of the respective planets in a Kalpa and divided by the number of Solar years in a Kalpa gives the planetary positions at the end of the last Solar year. Comm. This is a simple rule of three. The plane- tary positions so got, leaving out the integral numbers of revolutions made which are not required, are called the Dhruvakas of the respective planets for the ensuing solar year. With respect to the apogee of the Sun and the aphelia and nodes of the star—planets these Dhruvakas themselves give their positions for the whole ensuing year, as their motion is very very slow. Verse 10. An alternative method of obtaining the Dhruvaka of the Moon. The Adhimāsa Sesha multiplied by 12 gives the posi- tion of the Moon at the Commencement of the Solar year. Comm. Since the position of the Sun is at the Zero- point of the Zodiac at the Commencement of the solar year, and since the Adhimāsa Sesha is the difference of the solar and luni-Solar systems of reckoning, or what is the same, the arc gained by the Moon over the Sun, which is no other than the elongation of the Moon measured in Tithis each tithi being of 12° gain of elongation, so the Adhimāsa Sesha at the Commencement of the solar year in Tithis multiplied by 12 gives the longitude of the Moon at that Commencement. (Note - Bhaskara waxes into poetic eloquence in the second half of the verse, having given the procedure in the first half). Verse 11. Procedure prescribed in the event of com- puting planetary positions from the beginning of the Kaliyuga for the sake of convenience.