[ J92] 
pcrties, I concluded, that the real internal contact 
was at 8 h i6 / 47 /r by the clock j which makes 
8 h 1 6' 11" equal time, and 8 h 18' 2 " apparent time, 
atChelfea; and 8 h 18' 43" apparent time, at Green- 
wich. 
Whilft Venus was on the fun’s limb, no other 
penumbra appeared between the limb of Venus 
and the fun, than had appeared before on the fun’s 
difk ; and therefore, I concluded there mult be an 
atmofphere about Venus, which, receiving weak im- 
preffions of light between the limbs of Venus and 
the fun, occasioned the uncertainty of afcertaining 
the exadt inftant of the internal contadt, as above de- 
scribed j and becaufe my Newtonian refledtor thewed 
objedts clearer than the generality of Gregorian re- 
fledtors, I concluded, that the aforegoing property 
was what no two feet refledtor was capable of exa- 
mining, the atmofphere being fo narrow. 
At 8 h 3 5' per clock, the external contadt was near, 
and not incumbered with fuch a penumbra, or partial 
light, as the internal contadt had been. At 8 h 35' 4", 
the lead: dent poflible, quite black, appeared in the 
fun’s limb. And at 8 h 35' 6", the limb was reftored 
to its perfedt form, there having been a Small trem- 
bling light, between the narrow watery border of 
Venus and the vanifhing point of contadt in the fun’s 
limb for thefe two Seconds of time. From which the 
of the fame colour, through a dark glafs, as the fky. This was 
verified by a two feet Gregorian refledlor, in the contadl above- 
mentioned, and poflibly may have occafioned greater differences 
in eftimating the contadl, with leflfer telcfcopes, to no lefs than 
Half a minute of time. 
external 
