[ 334 ] 
vation at Tobolfk and at Rodrigues is very nearly the 
fame, confequently that the Sun’s parallax is very nearly 
— 8", 5. If we purfue this fubjedt to a greater preci- 
fion, and fuppofe that the meafurement of the greatefl 
diftance of the limbs of the Sun and Venus, taken 
by M. Pingre, to be perfe&ly cxadt, and compute 
on true * principles the apparent lead: diftances of 
the centers from the durations obferved at the differ- 
ent places in the north (the method of which I fhall 
afterwards give) the parallax of the Sun will come 
out as follows, when they are compared with that 
meafured at Rodrigues : 
| Cajan. I Calm. 1 Tobol. 
Rodrigue* 1 8”, 60 1 8", 58 J 8", 65 
Torn. | Upfal. | Stoko. | Abo. ] Herno. J 
8", 48 1 8", 60 j 8", 4 o 1 8", 63 1 8", sj | 
The mean of thefe eight comparifons gives the 
Sun’s parallax = 8", 56 being the very fame, as that 
which we found before by the comparifons of the 
internal contacts. 
Again let us reduce the obferved durations, at the 
following feveral places, to the center, on the fup- 
pofition that the Sun’s parallax is =- 8", 56 as in the 
following table. 
Tobolfk. 
j* 
5 48 53— Obf.Du. 
o 9 6=Parallax. 
5 58 59=Cent.D. 
Cajaneburg. 
b 
5 49 54=Obf.Du. 
o 8 8=Parallax. 
5 58 2=Cent. D. 
Tornea. 
h 
5 50 9nObf. Du, 
o 8 3=:Parallax. 
5 58 i2=Cent. D. 
* I fay on true principles, becaufe I have realon to think that 
there is a miftake in the method given by M, Pingre in the a- 
forefaid Memoir. 
1- Upfal. 
