C 577 ] 
tions. From thefe things we may gather by an ob- 
vious Computation, that Mercury was in Conjunction 
with the Sun, in refpeCt of Longitude, at 5 h , 47', with 
14', 59", North Latitude 5 and that his neareft Diftance 
to the Centre of the Sun was 14', 44"; and when 
he was at his neareft Diftance, the Difference of his 
Longitude from the Suns was 2', 3 9", which he paffed 
over in 40' of Time, and confequently arrived at the 
Middle of his Courfe in the Sun at 6 h , 27' : Whence 
the Semiduration of the central Tranfit was ih, 30', 
and the End at 57', an Hour after Sun-fet. 
As to the Place of Mercury s Nodes, the Inclina- 
tion of his Orbit to the Ecliptic, and the other Ele- 
ments of his Theory, I pretend not to determine any 
thing from fo fhort a Series of Obfervations as this. 
I content myfelf with the foregoing Determinations, 
which, I hope, are not far from the Truth, having 
taken all the Care I could, both in the Obfervations 
and Calculations. 
I was in Hopes to have made a good Obfervation 
of the Lunar Eclipfe, which happened laft Week : But 
the Sky, which at the Beginning of the Eclipfe was 
very clear, foon became overcaft, which hindered 
me from making above One or Two Obfervations 
that I could depend upon; and they were as follows : 
21 "December 174°- 
At 5. 24. A plain Penumbra. 
3 5 . The true Shadow feems to enter. 
47. Touches Talus Mar# otzs. 
5 3 • Reaches Mount Sinai . 
After 
