[ 60 ] 
Greenwich and Tobiefke is fcarcely more than 
4 h 3 2 ' 55 ' • That between the meridians of Green- 
wich and Selenginfk, to judge from the three im- 
merfions obferved there, fhould be but y h 6 ' o, but 
from other confiderations, I think it mud: be 1 o or 
15' more. If the longitude of thefe places fhould 
be more exadly determined, I am perfuaded that we 
fhould obtain the parallax of the Sun to nearly the 
tenth of a fecond, fo exad the obfervations made at 
Selenginfk and Tobiefke and the Cape appear to me. 
I fee you did not communicate to the Royal So- 
ciety all the obfervations made by Mr. Planman at 
Cajaneberg, they however deferve to be preferved. 
He obferved 
h / // 
The beginning of the entrance - - at 3 59 56M 
Total immerfion of Venus or inte- ) g 
Second interior contad or beginning \ 
of the exit - - - -J-'° 7 59 
Total emerfion - - - - - — 10 26 22 
Mr. Planman made ufe of a telefcope of 20 or 21 
feet; the latitude of Cajanebourg is 64° 13' 30"; 
the difference of meridians between Greenwich and 
Cajaneburg is fufficiently determined by obfervations 
upon the eclipfe of the Moon the 18th May 
1761, made at Stockholm and Cajaneburg. 
I have the honour to be with the greateft efteem, 
S I R, 
Your very humble and obedient fervant, 
P. Wargentin. 
2 
Eclipfes 
