[ 586 ] 
Clock. True Time. 
b / // h ' " 
ii 56 21 ii 48 18 End of the Eclipfe by the 
preceding Chord. 
Mr. le Monnier meafur’d with the Micrometer the 
apparent equatorial Diameter of the Moon, when 
ihe was upon the Sun 5 which he found = 19' 47 "7. 
He meafured alfo the apparent vertical Diameter of 
the Sun at Noon; which he found = 31' 40". 
The Micrometer, with which he meafured thefe 
Diameters, was afterwards verified, by a Bafe of 
2)70 Feet, and two Marks, placed at right Angles 
to its Extremity, ar the Diftance of 22 Feet from 
one another. 
The Flafh of the firft: Cannon fired from the Caftle 
was feenat i2 h 3' 4" bythe Clock; and the Flafh of 
the fecond Cannon alfo by the Clock at 12k 8' 4A 
The Eclipfe was fo nearly annular, that, at the 
nearefi: Approach, the Cufps feemed to want about 
i- of the Moon’s Circumference to be joined ; yet 
a brown Light was plainly oblerved, both by my 
Lord Morton and myfclf, to proceed or ftretch along 
the Circumference of the Moon, from each of the 
Cufps, about l of the whole Diftance of the Cufps 
from each Cufp ; and there remained about i- of 
the whole Diftance of the Cufps not enlightned 
by this brown Light; fo that we were for fome time 
in Sufpenfe whether or not we were to have the 
Eclipfe annular with us. I obferved, at the Extre- 
mity of this brown Light, which came from the 
Weftern Cufp, a larger Quantity of Light, than in 
any other Place, which at firft furprized me; but 
afterwards 
