356 ON THE INDIAN, &C. 



visible at Vjjaymi, when the sun is 7° short of the sign 

 Virgo." But he afterwards adds, that *^ the star becomes 

 risible, when the sun reaches Hasta^ and disappears 

 vvhen the sun arrives at Roh'miy His commentator re- 

 marks, that the author has here followed earlier writers ; 

 and quotes Para'sara saying, "When the sun is in 

 Hasta, the star rises; audit sets when the sun is in 

 R6hini*y Bhattotpala cites from the five Sid- 

 d''hdntas a rule of computation, analogous to that, which 

 will be forthwith quoted from the Bhdswatt ; and re- 

 marks, that three periods of AgaHycvs heliacal rising 

 are observed, viz. StJi and 15th oi Aswlna and 8th of 

 Cdrtua, 



The Bhdswatt directs the ''day of Agastyas rising 

 for any particular latitude to be fouud by the following 

 rule. ' The length of the shadow of a gnomon \ at 

 a particular latitude, on the day of the equinox, is mul- 

 tiplied by 25 ; and to the product 000 are added ; the 

 sum, divided by 225, gives in signs and degrees the 

 place of the sun, on the day, when Agastya rises or 

 appears in the south, at the close of night.' The com- 

 mentator adds, that ' the day of the star's setting may 

 be computed by deducting the sum found as«^bove, 

 from 1350 ; the difference reduced to signs and degrees, 

 is the place of the sun,- on the day, when Agastya sets 

 in the southwest.* According to these rules, Agastya 

 in latitude 26^ 34', rises when the sun is in 4* 20° and 

 sets when the sun is in 1^ 10°. 



The Grahaldghava teaches another method of 

 calculation. The length of the shadow of the 

 gnomon is multiplied by 8, and the product is 



I" la duodccinial" parts. 



