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with the ecliptic 8°. 29'. 02"; the angle of the 
ecliptic with the equator ~ 7°. 02h 54^^ and there- 
fore the angle made by the planet’s vifible path with 
the equator — . 1 5°. 31'. 56'h The geocentric lati- 
tude is, as has been obferved, — loh 13''^ 5 : and 
hence it is eahly determined that the lead: diftance 
of the centers will be loh o6'',8, and the interval 
between the time of the ecliptic conjundion and the 
middle of the tranfit r= 22'. 21". of time. As the 
planet has not yet paiTed its node, the middle of the 
tranfit will therefore be at 10''. 2ih 45'^ mean time 
at Greenwich. In every inferior conjundion the 
motion of Venus is retrograde, and therefore the 
effed of the aberration of light in long. — 3'^/, 
when reduced to time — 55'h is to accelerate the 
feveral phafes of the tranfit ; the equated mean time 
of the middle, therefore, will be at io\ 20'. 50'''. 
But the place of the planet is alfo affeded by the 
aberration of light in latitude; and as Venus’s lati- 
tude is decreafing, the lead didance of the centers 
will be increafed by 1", 35. The equated lead 
didance of the centers, therefore, will be 10'. 08'"', 
15. Now, fuppofing the femi-diameter of the fun 
15'. 45'',6, and of Venus = 29", the femi- 
durations, or intervals between the middle and the 
external and internal contads, will be found — 3^. 
joh o 8'^5, and 2K 51'. 13^', 2. The equation of 
time is about 2'. 14^' at the middle of the tranfit, by 
which quantity the apparent time is before the mean, 
and decreafes at the rate of about 2^'' in 6 hours. 
Therefore the apparent times of the feveral phafes of 
this tranfit for the meridian of Greenwich are as 
follows. 
VoL. LV, U u 
Fird 
