[ 33 ° ] 
piter’s frit fatellite, and the difference of longitude 
between Upfal and Tobollk is fettled, by the obfer- 
vations of the contact at the ingrefs at both places, 
by the method of M. Pingre above mentioned. 
Therefore the difference of longitude between the 
Cape and Tobollk is very exadtly fettled, fo exa&ly, 
that I am perfwaded that the error does not amount 
to 5 or 6 feconds. Therefore the error in the paral- 
lax arifing from the error of the difference of longi- 
tude is extremely fmall, fcarcely amounting to — L. 
part of a fecond. Therefore we are certain that the 
error in the fun’s parallax arifing both from the error 
of obfervation and the error of longitude does not 
exceed ^ of a fecond in the comparifon of the ob- 
servations of the internal contact at Tobollk and at 
the Cape, even though we had no more obfervations 
to determine the Sun’s parallax ; but the mean of a 
great many more mull bring it very near the truth. 
I now proceed to determine the parallax of the 
Sun from the total durations obferved at different 
places. If therefore we compare the durations ob- 
ferved at Tobollk, Cajaneburg, Abo, and Tornea, 
with the durations obferved at Madrafs, Grand Mount 
and Tranquebar, which give the greatelf differences, 
the refults of the Sun’s parallax will be as follow. 
Tobollk 
