[ 5°6 ] 
I could not be fo certain of the moment when he 
left the Sun, as of his interior contadt. For the Sun’s- 
limb, undulating in the vapours of the horizon, made 
it fomewhat difficult to judge when the indenture, 
formed by the Planet upon it, intirely ceafed. How- 
ever, I believe this latter obfervation may be relied 
on to 4 or 5''. The comparifon of this obfervation 
with thofe made in Europe will, I prefume, deter- 
mine the difference of meridians within a few fe- 
conds of time. 
I beg, Sir, you will excufe the freedom I have now 
taken, fince it is in the caufe of aftronomy, and allow 
me to fubfcribe myfelf, with great refpedt. 
Reverend Sir, 
Your moft obedient. 
Cambridge, New England, 
20 June, 1763. 
humble fervant, 
John Winthrop, 
LXVllI. A Method 
