150 REMARKS on the 



gan, or how many days have elapfed fince the beginning of it, 

 and then, by the table of the duration of months, they re- 

 duce thefe days into aftronomical months, days, Sfc. which 

 is the fame with the figns, degrees and minutes of the fun's 

 longitude from the beginning of the zodiac. The fun's lon- 

 gitude, therefore, is found. 



19. Somewhat in the fame manner, but by a rule flill more 

 artificial and ingenious, they deduce the place of the moon, at 

 any given time, from her place at the beginning of the Cal- 

 yougham *. This rule is fo contrived, as to include at once the 

 motions both of the moon and of her apogee, and depends on 

 this principle, according to the very fkilful interpretation of 

 M. Bailly, that, 1,600,894 days after the above mentioned 

 epoch, the moon was in her apogee, and 7% 2°, o', 7", diftant 

 from the beginning of the zodiac ; that after 12,372 days, the 

 moon was again in her apogee, with her longitude increafed, 

 o/, 27 °, 48', 10"; that in 3031 days more, the moon is again 

 in her apogee, with n J , 7°, 31', 1", more of longitude ; and, 

 laftly, that, after 248 days, me is again in her apogee, with 

 27 , 44', 6", more of longitude. By means of the three 

 former numbers, they find, how far, at any given time, the 

 moon is advanced in this period of 248 days, and by a table, 

 exprefling how long the moon takes to pafs through each degree 

 of her orbit, during that period, they find how far fhe is then 

 advanced in the zodiac f. This rule is ftrongly marked with 

 all the peculiar characters of the Indian aflronomy : It is re- 

 markable for its accuracy, and ftill more for its ingenuity and 

 refinement ; but is not reduced withal, to its ultimate fim- 

 plicity. 



20. The tables of Tirvalore, however, though they differ 

 in form very much from thofe formerly defcribed, agree with 



them 



* Mem. Acad, des Scien. ibid. p. 229. Aft. Ind. p 84. 



I M. le Gentil has given this table, Mem. Aead. ibid. p. 261. 



