[ 357 ] 
differ . But about of Venus’s diameter muff 
have entered upon the Sun before I perceived theim- 
predion. At nine in the morning, I obferved the 
Sun’s diameter, in the horizontal diredion, to be 
I 21 I parts of the micrometer, — 31' 3 3'''', 2. 
At5^'3 4.' 23'', the Sun’s north limb was diftant 
from Venus’s fouth limb 9 3 of the micrometer, er: 
6' i 6’^,2. At 5^ 37' 23' , I found no fenfible dif- 
ference ; and the Sun’s north limb was then diffant 
from Venus’s north limb 7 of the micrometer, — 
3' i 7^^6. This gives Venus’s diameter 58'^, 6 j and 
the leaft diifance of centers 9' 5 9^', 7. Hence, the 
true duration of the ingrefs daould be 18^ 36"'^ but 
this being here contracted i 5'', by parallax, is reduced 
to 18'' 4 Tb So that the firft contad, dridly fo called, 
happened before the impreffion was difeovered ; 
and the central ingrefs was at 2^^ 38^ 5'^ The neared 
approach was nearly, I fuppofe, at 5^ 37b 
After Venus was entered upon the Sun, I viewed 
lier attentively feveral times, with a power of the great 
telefcope which magnified 260 times, but could per- 
ceive no fuch duflciflinefs round her as I favv at the 
internal contad, nor that imperfed light upon her 
difk, efpecially near the centre, which Mr, Dunn 
fpeaks of 3 neither could I difeover any fatcllite. Soon 
after fix, the weftern fky began to be over-cad, fo 
that for a confiderable time before fun-fet the Sun. 
was hid, 
I made obfervations for determining fome' other 
pofitions of Venus upon the Sun j but as they can be 
of no fcrvicc in the grand problem of the parallax, I 
think it needlefs tofwell this letter, very long already,, 
with them. 1 therefore only add, that the latitude of 
this- 
