[ 29 ] English Astronomy. Skrya-Siddhanta* Siddhápta-Darparu Sun 1° 55' 19" 2° 10 31" 1° 55' 33" Moon 6 3 41 5 2 46 6 1 10 It will be needless to compare the rates of motion of the modes and apsides. It is possible for modern European astro- nomy, with instruments enabling it with ease to measure the three thousand and six frundredth part of a degree, and with its engines of higher mathematics to handle intricate problems,- unheard of before,--to deduce the elemonts of orbits from a very few observations made at no distant dates. But it requires the lapse of years—18y centuries--to do the same with primitive instruments and equally primitive mathematics. The motions of the nodes and apsides are so slow that Bhaskara despaired of ever measuring them. Chandrasekhara was equally in despair in these cases. But as the positions of the moon's nodes and perigee are oftener required, and their motions comparatively rapid, I quote their sidereal period in mean solar days. Eng. Ast Súrya-8. Siromani. Daграда, Node 6798-279 6794395 6792-254 6792-644 Perigee 3232-575 3232 094 3232.734 The reader will notice that Chandrasekhara has devised å correction to be applied to the Mandochcha of the planets, Mer- cury, Mars and Saturn. He has called it Parochcha and the greatest amounts are 11° 20, 7° 30' and 5° for the three planets respectively (V. 76). 3232.657
- According to Biromaņi, the sun's equation is the same as is shown
under Súrya-Siddbánts, and the moon's equation is slightly less, Digitized by Google
