C 364 j 
exterior limb. After Venus was wholly on the Sun, he 
faw a faint ring of light furrounding her, both with the 
34- feet telefcope, and Mr. Nairne’s 2 feet refledtor. 
When i. d of Venus’s diameter was entered upon 
the Sun, Mr. Dollond frft faw a light about the ex- 
terior limb of the planet : this light, during all the 
time of its continuance, appeared rather reddifh, and 
in all refpedts like irregular refradted light. After 
Venus was wholly entered upon the Sun, he faw a 
faint ring furrounding her. 
After Venus was wholly entered upon the Sun, 
and her exterior limb was near one of her femi-dia- 
meters diftant from the Sun’s circumference, Mr. 
Nairne faw a faint light round the planet, rather 
brighter and whiter than the body of the Sun. 
Fortunately, the weather was as favourable for the 
obfervation of the eclipfe of the Sun, the next morn- 
ing, as it had been the evening before for that of the 
ingrefs of Venus upon the Sun which is of the more 
confequence, as the comparifon of it with the obfer- 
vations which may be made of it in the northern and 
eadern parts of the world will ferve to fettle the lon- 
gitudes of thofe places, and confequcntly render the 
obfervations which may be made there of the tranfrt 
more ufeful and valuable. 
I obferved the beginningoftheeclipfeat 1 8 h 3 8 / 5^ // , 
and the end at 2o h 23' 3 o" apparent time, with the 
2 feet refledtor, ufing the magnifying power 90 times. 
And at i9 h 29' 3i // apparent time, I obferved the 
greateft eclipfe, at which time I found the remaining 
lucid parts of the Sun 15' i5 // with Dollond’s micro- 
meter, affuming the horizontal diameter of the Sun 
