[ 33i ] 
Sun’s Par, Difference of duration, ■ 
Tobolfk and Madrafs - - = 9. 61 2 50 
G. Mount = 8. 33 2 27 
Tranquebar = 8. 52 2 40 
Cajaneburg and Madrafs — 10. 09 r. 1 49 
G. Mount == 8. 00 1 26 
Tranquebar — 8. 33 1 39 
Abo and Madrafs - -- = 10. 66 r. 134 
G. Mount =8.33 1 11 
Tranquebar = 8. 60 1 24 
Tornea and Madrafs - - — 9. 20 1 34 
G. Mount - — 7. 00 r. 1 11 
Tranquebar = . 7. 50 r. 1 24 
The mean of thefe 12 refults gives the Sun’s pa- 
rallax — 8 / V 68, and if we rejedt four of them, 
which are marked with the letter r, and which differ 
the moll from the reft, the mean of the remaining 8 
gives the Sun’s parallax 8", 61. 
This determination of the Sun’s parallax cannot 
be depended on to any great precifion, becaufe of 
the fmall differences between the durations compared, 
the greatefl of which amounts only to 2' 5 o' 7 , and 
alfo becaufe of the fmall number of comparifons. It 
ferves only to fhew nearly what is the quantity of the 
Sun’s parallax. 
We are now to determine the limits of the error 
in the determination of the Sun’s parallax by the du- 
rations obferved at two different places. The greatefl 
difference of duration is between Tobolfk and Ma- 
drafs, which amounts only to 2' 50". If therefore 
1 ana 
