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

42 planet to be computed is got by multiplying the planetary position of a planet computed by the number of sidereal revolutions of the planet to be computed and dividing by the number of sidereal revolutions of the planet computed. Verse 15. We get the Ahargaṇa by multiplying the planetary position given in number of revolutions and fraction of a revolution by the number of days in a Kalpa and dividing by the number of sidereal revolutions in a Kalpa. How by indeterminate analysis we get the same Ahargaṇa, given the number of past sidereal revolutions alone, or by the fractional part of a revolution alone, or by the sum of the fractional parts in the case of more items involved, I shall tell later. Comm. While computing the planet we have the formula (A × P) / M = p where A = Ahargaṇa, P = the num- ber of sidereal revolutions of the planet, M = number of mean solar days in a Kalpa and p = the planetary position consisting of the number of past revolutions and also the fraction of a revolution. From the above equation, the Ahargaṇa A = (M × p) / P as stated. In tne case of only the integral number of revolutions or the fraction of a revolution alone being given, or the sum of remainders if more items than one are involved, the method of fiinding the Ahargaṇa is illustrated in golādhyāya under praśna- adhyāya under verses 12—21. Verses 16, 17. Method of getting the time in solar years that has elapsed from the beginning of the Kalpa, given the Ahargaṇa. The given Ahargaṇa multiplied by the number of Kshaya-tithis in a Kalpa and divided by the number of civil days in a Kalpa gives the number of the elapsed Kshaya tithis. Adding these to the Ahargaṇa we have the lunar