^76 ON THE ANTIQUITY OF 



agreeing with the Surya Siddhdnta within seven 

 seconds. 



68. From the aphelion of Mars we get 641 years 

 for the age of the Surya Siddhanta : 



Thus, the longitude of the aphelion of Mars at 

 the end of the year 4900 of the. Caliijug: 



By the Surya Siddhdnta = ^ 43200 0000"^ 92 rev. 



4' 10" 2' 35" 54" 

 By De la Lande's tables Hindu 



sphere (§12) 4 11 30 57 30 



Differencej the former less advanced 



by 1 28 21 6 



Mean motion per century oi Hindu years. 

 By the Surya Siddhanta =00067 



By De la Lande's tables, Hindu 



sphere = i3 53 3 



Difference, the former slow by 1 3 46 56 



TT l<'28'21"S6"'4-loo ^,, 



Hence, 13 ,^ ,J = 641 years. 



69. From the length of the year =365'"- i5'°- 3i' 

 31" 24"', we get 736 years, for the age of the Surya 

 Siddhdnta: 



Thus, in the formula -^3; =;/, (§ 4l) we have 

 d = 9^^- 52"" 39' 1 6"', h = 365°'- 1 5'" 3 1 ' 32" 24"'; and 

 s = 365°'- 1 5^"- 22' 59". Hence ^ = 7i == ^-^-^ == 

 4164 of the Caliyugy when the year was of the given 

 length. Therefore 4900 — 4164=736 years, the 

 age of the Surya Siddhdnta. 



70. Let the results of the foregoing operations 

 be now collected together, in order to obtain a mean 

 of the whole ; and we shall have 



From 



