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

31 elapsed number of solar days, for, we have construed the one, two or three luni-Solar years as mean solar as well as the elapsed lunations of the present year as solar months; but this difference does not affect the computation of Adhika- māsas as mentioned above). Then, as we are given that 15933,00000 Adhikamāsas occur in 1555200000000 solar days of the Kalpa, if x be the number of solar days found above, (x ✕ 1593300000) / 1555200000000 will give the number of the elapsed Adhikamāsas. Adding these Adhikamāsas multiplied by 30, to x the solar days obtained above, we have the Tithis elap- sed upto the day in question. If now, we subtract the Kshayāhās from these Tithis, we shall have the number of Sāvanāhas or the Ahargaṇa required. Since in 1602999000000 Tithis of the Kalpa there will be 25082550000 Kshayāhas, if y be the Tithis above obtained, (y ✕ 25082550000) / 1602999000000 will be the Kshayāhās from the beginning of the Kalpa upto the day in question ; subtracting these from y, we have the required Ahargaṇa. Verse 4. Computation of the planetary positions. The Ahargaṇa multiplied by the number of sidereal revolutions of a planet and divided by the number of civil days in a Kalpa gives the planet ie its number of revolu- tions upto the day concerned both integral and fractional. Comm. Applying ‘Rule of three’, if in C the number of civil days in the Kalpa, the planet makes P sidereal revolutions how many revolutions would have been made in A the Ahargaṇa ? The answer is (A ✕ P) / C. In this, the integral quotient gives the number of complete revolu- tions made; the remainder, multiplied by 12 and divided by C again, gives the number of Rasis covered by the planet from the Zero-point of the Zodiac, and again the remainder multiplied by 30 and divided by C gives the number of deg-