[ 6x6 ] 
I fhall explain this table by the example of the 
obfervation at Greenwich compared with the obfer- 
vation at the Cape, which is the firft in the table. 
9 h 50" is the mean of the times of the inter- 
nal contact obferved at the Cape, i h 13' 3 is the 
difference of longitude between Greenwich and the 
Cape, this being fubftradted from the time of the ob- 
ferved contact at the Cape, leaves 8 h 26' 15" for 
the time the obfervers at Greenwich fhould have 
feen the contact, if there had been no parallax of 
Venus ; fubtradting therefore the time of the obferv- 
ed contact at Greenwich from this time, the remaind- 
er, 7' 15" is the effedt of the parallaxes of longi- 
tude and latitude at the two places of obfervation. 
But the effedt of thefe two parallaxes at the Cape, 
on the fuppofition of the Sun’s parallax being — 8" i., 
is — 6' 8", by which quantity of time the obfervers 
at the Cape fhould have feen the internal contadt later 
than at the center of the earth : and the effedt of the 
fame parallaxes at Greenwich is = 1' 1 1 // , < by which 
quantity of time the obfervers at Greenwich fhould 
have feen the internal contadt fooner than at the 
center of the earth. The fum therefore of thefe two 
quantities is = 7' 19", by which quantity of time 
the obfervers at Greenwich fhould have feen the in- 
ternal contadt fooner than the obfervers at the Cape 
in abfolute time, had the Sun’s parallax been = 8 " 4.. 
But the difference in abfolute time as found by ob- 
fervation, as above, is only = 7' 15 » therefore the 
Sun’s parallax, by fuppolition, viz. 8", 5, is to the 
parallax of the Sun found by obfervation, as 7' 19' 
is to J f 15", which gives 8 // , 42 for the Suns paral- 
lax, on the day of the tranfit, by this obfervation, 
which 
