$o6 Mr* will a ,< r © on the Longitude 
I had no micrometer to meafure the lucid part of the fun in. 
its leaf: hate, and thereby determine the error of MAfEs’s 
tables in latitude at the middle of this eclipfe. But according 
to the obfervations of Profeflor williams, Dr. winthrop’s 
fuccelTor, the error was not great. He and feveral affiftants 
obferved this eclipfe at Long Ifland in Penobfcot Bay. The 
latitude of the place of obfervation he found to be 44 0 1 7' y" N. 
‘He obferved the beginning of the eclipfe at 1 1 h. if 8 V A.M„ 
and the end at 1 h. 50' 25" P.M. apparent time. He was fur- 
nifhed with an excellent dollond’s micrometer, with which 
he meafured the fun’s diameter on the morning of the eclipfe, 
and the lucid parts many times during its continuance. By his 
obfervations, compared with thofe made at Beverly, I find the 
difference of meridians between Beverly and Long Ifland to 
S' 4" in time. The time of the greateft obfcuration was at 
1 2 h. 30' 22", when the lucid part of the fun was 8" on the 
lower limb. The fun’s femi-diameter according to obfervation 
was 1 6' 8", 7 ; the moon’s horizontal femi-diameter, according 
to the tables, 16' 23^,8 ; the augmentation of her femi-dia- 
meter, agreeably to her altitude, 9", 5 ; the fum of the vifible 
femi-diameters of the fun and moon therefore 32' 42". The 
lucid part of the fun 8" being fubtra&ed from 32' 17^4, the 
fun’s diameter, leaves 32' 9", 4 for the eclipfed part of the fun, 
which fubtraCted from 32' 42" leaves 32", 6 for the leaf! dis- 
tance of the centers of the fun and moon. The vifible angle 
of the moon with the fun was, I find, 15° 54' 54", and her 
motion from the fun in her vifible orbit 24", 5 in one minute; 
the vifible ecliptic conjunction therefore was at 12I1. 29' $y/\ 
and the diftance of the centers of the/ fun and moon 34". The 
moon’s parallax in latitude from the fun was then 49' i5, // 8 S. 
which abided to 34" gives 49' 49 // ,8 N. equal to the moon’s lath 
2 tude 
