ASTRONOMICAL LABOURS OF JAYASINHA. 205 



fame kind as fig. B. and probably, as Mr. Williams 

 fays, never completed, as I found no appearance of 

 graduation on the circle. 



Having defcribed thofe among the obfervatories 

 conftrucled by Jayafmha, which have fallen under my 

 obfervation, I proceed to give fome account of the ta- 

 bles intitled Zeej Mahommedfliahy . But here I fhould 

 regret that, not having accefs to the Tabula Ludovieia 

 of La Hire, I am unable to determine, whether thofe 

 of Jayafmha are merely taken from the former, by 

 adapting them to the Arabian lunar year ; or, whe- 

 ther, as he afFerts, they are corrected by his own ob- 

 fervations ; did not the zeal for promoting enquiries 

 of this nature, manifefted in the queries propoied to 

 the Afiatick Society by Profeflbr Playfair (to whom 

 I intend to tranfmit a copy of the Zeej Mahommed- 

 Jhahy) convince me, that he will afcertain, better than 

 I could have done, the point in queftion. 



I. Tables of the Sun confifl of 



1. Mean longitudes of the fun, and of his apogee, 

 for current years of the Hejira from 1141 to 

 1171 inclufive. 



2. Mean motions of the fun, and of his apogee, for 

 the following periods of Arabian years, viz. 30, 

 60,90, 120, 150, 180, 210, 240, 270, 300, <XX>, 

 900, 1200. 



3. Mean motions of the Sun, and of his apogee, 

 for Arabian months. 



• 4. The fame for days from 1 to 31. 



5. The fame for hours, 24 to a natural day; but 

 thefe are continued to 65 ; fo that the numbers 

 anfwering to them, taken for the next lower de- 

 nomination, anfwer for minutes. 



6. The fame for years complete of the Hejira, from 

 1 to 31. 



N 3 7. Tta 



