[ 645 ] 
yet untouched, and the Moon’s dark limb approach- 
ing towards it. At y h 37' 48" per clock it was got 
fo near the contact that I was going to pronounce it, 
but feeing the light between the Moon’s limb and 
the edge of this fpot diminifh gradually till y h 37' 
54" per clock, I concluded this laft to be the time 
of contad with the edge of this fpot. At y h 38' 17" 
per clock this fpot was centrally biffeded by the line 
of the Moon’s dark limb, and at y h 38' 40'' per clock 
the edge of the fpot and its furface was covered, a 
few feconds of time after which, the little indiftind- 
nefs near its edge was quite vanished and gone. 
Whilft this obfervation was making, the fky was 
clear and the limbs of the Sun and Moon were free 
from undulation, and all other impediment, except 
the aforefaid little teeth-like uneavenneffes in the 
Moon’s limb. And what is remarkable, altho’ the 
three laft mentioned numbers were fet down exadly 
as taken on the fpot, they differ not from each other 
a fecond of time. Neverthelefs this opportunity has 
confirmed me in an opinion which I had entertained 
concerning the internal contad of Venus with the 
Sun’s limb 6th June 1761, fori conclude that the 
contad of this fpot with the Moon’s limb, could not 
have been judged of by different obfervers in the fame 
place, and with equal telfcopes without a difference of 
at leaft 5 feconds of time, which is much more con- 
iiderable than the fame number of feconds in the 
contad of Venus with the fun’s limb, the former be- 
ing fo fwift and the latter fo flow. 
I have not allowed the 6 " which the clock was 
before true time at the time of obfervation, nor re- 
duced the Phenomenon to Greenwich or any other 
meridian, 
