THE SURYA' SIDDHA'NTA, ^C. 563 



44. The length of the year being determined either 

 from the position of Chitra, or the precession of the 

 equinoxes as above explained (§ 39, 43), the next 

 thing a Hiiidu astronomer has to do (if he means to 

 form a compleat system in imitation of the Surya 

 Siddhanta)y is to ascertain the number of days to be 

 assigned to the cycle of 1080000 years. This is done 

 by multiplying the length of the year by that number. 

 For example let the length of the year A. D. 1799 

 deduced from the position of Chitra = 365'". Id'" 30' 

 I4' 25'", be multiplied by 1080000, and we shall 

 have 394479072, for the nearest number of days in 

 that cycle. 



45. In the Sunja Siddhanta the Calpa is made to 

 commence v^ath Sunday as the first day of the week, 

 and the present Call yugy is made to begin with Fn* 

 day. Therefore, in reckoning from the commence- 

 ment of the Calpa, the number of days to be as- 

 signed to the above cycle, must be so regulated that 

 the first day of the cycle which we now are in, may 

 fall on Friday. The number of cycles expired at 

 the commencement of the Cali yiig, was 1811; which 

 divided by 7, leaves a remainder of 5 : hence, every 

 cycle must contain a compleat number of weeks and 

 one day over, to make the present begin with Fri- 

 day* 



46. The number of revolutions of the Moon in the 

 cycle of 1080000 years, and the number of mean solar 

 days in the same period should be so adjusted with each 

 other, as to give the relative positions of the Sun and 

 Moon agreeing with observation. This is effected 

 by encreasing or diminishing the number of days, or 

 the Moon's revolutions, or both ; until the relative po- 

 sitions of the luminaries are obtained sufiiciently cor- 

 rect. The adjustment in the days, must be made 

 . by 



