Page:Sewell Indian chronography.pdf/69
152. For convenience of reference I give here a list of elements of the Sūrya Siddhānta with the bīja, similar to those without it in § 142:—
| A. Civil days in a mahāyuga | 1,577,917,828 days. |
| B. Revolutions of Jupiter in that period | 364,212 |
| C. One revolution, or A ÷ B | 4332.415812768 days. |
| D. One saṁvatsara, or C ÷ 12 | 361.034651064 days. |
| (361 d. 0 h. 49 m. 54 s.) | |
| E. Length of sidereal solar year | 365.2587564̇81̇ days. |
| (365 d. 6 h. 12 m. 37 s.) | |
| F. Difference between lengths of solar year, E. and saṁvatsara, D. | 4.224105417 days. |
| (4 d. 5 h. 22 m. 43 s.) | |
| G. Śōdhya | 2.170694̇ days. |
| (2 d. 4 h. 5 m. 48 s.) | |
| H. Cycle difference, F − 60 | 253.446325020 days. |
| I. Additive difference for beginnings of successive cycles | 111.81231461 days. |
153. The work is precisely similar to that in the former case, but Tables XXVIII. and XXVIII.A are to be used in place of Tables XXVII. and XXVII.A.
154. The First Ārya Siddhānta came into use about A.D. 499, being the work of the astronomer Āryabhaṭa. It differs slightly from the Sūrya Siddhānta in the length of both the solar and the Jovian year. According to it the epoch of the Kaliyuga era was the moment of mean sunrise on February 18th, 3102 B.C., or 0 hour Laṅkā time—six hours later than that fixed by the author of the Sūrya Siddhānta. This was the moment of beginning of K.Y. 1 current. At this moment the longitude of Jupiter was held to be, like that of the mean sun, 0°, or in other words the Jovian saṁvatsara began exactly at the moment of mean Mēsha saṁkrānti of K.Y. 1 current. This saṁvatsara was Vijaya (No. 27), as before.
155. The elements of the First Ārya Siddhānta are as follows:—
| A. Civil days in Mahāyuga | 1,577,917,500 days. |
| B. Revolutions of Jupiter in that period | 364,224 |
| C. One revolution, A ÷ B | 4332.272173168 days. |
| D. One saṁvatsara, C ÷ 12 | 361.022681097 days. |
| (361 d. 0 h. 32 m. 40 s.) | |
| E. Length of solar year | 365.2586805̇ days. |
| (365 d. 6 h. 12 m. 30 s.) | |
| F. Difference between solar year, E. and saṁvatsara, D. | 4.235999458 days. |
| (4 d. 5 h. 39 m. 50 s.) | |
| G. Śōdhya | 2.1475694̇ days. |
| (2 d. 3 h. 32 m. 30 s.) | |
| H. F × 60 (cycle difference) | 254.159967480 days. |
| I. E &minus H, additive difference for successive cycle-beginnings | 111.09873075 days. |
Mean Mēsha saṁkrānti took place 2.1475694̇ days (= G) after apparent Mēsha saṁkrānti; and therefore Vijaya began by that interval of time after the latter in K.Y. 1. 1 Prabhava of the next