SYSTEMS OF ASTRONOMY. 217 



Here we have a most decisive proof of the prin- 

 ciples on which the system given in the Surya 

 Siddhdnta is founded, and consequently of the 

 time at or near which that work was written : for 

 the motions, above deduced from computation, 

 scarcely differ half a second from those given in 

 the Surija Siddhdnta. 13ut these differences, small 

 as they are, do not arise from errors in observation, 

 but from the revolutions of the planets assigned to 

 the cycle of years assumed by the autlior of the 

 Surya Siddhanta. 



In the Surya Siddhdnta, the least cycle in which ^ 

 the planets are assumed to return to a line of m.ean 

 conjunction in the beginning of Aries, is lOSOOOO 

 years. Let the motions above found, tlierefore, 

 be multiplied by this number, and we shall have 



Revolutions. s. ^ 



Sun, 1080000 00 in 1030000 years. 



Moon, 14438334 06 



Venus, 1755593 7 18 • ■ — 



Mars, 57420/ I 09 • 



Jupiter, 91054 8 12 ■ • 



Saturn, 36642 24 



