C 471 ] 
by procuring obfervations to be made upon this tranf- 
it in fuch places where the difference or time between, 
the ingrefs and egreis would be the greateft poffible; 
namely near the mouth of the Ganges, where the Sun 
would be vertical at the middle of the tranfit, and 
at Port-Nelfon in Hudfon’s-Bay, where the planet 
would enter upon the Sun’s difk about the time of Sun- 
let, and leave itfoon after Sun-riling; for in the former 
place, fays Dr. Halley, the planet would be equally 
diftant from noon both at ingrefs and egreis, and the 
apparent motion of Venus upon the Sun would be ac- 
celerated by almoft double the quantity of the horizon- 
tal paiallax of Venus from the Sun : becaufe Venus is 
at that time retrograde, and moves in a direction con- 
trary to that of the eye of an obferver upon the earth’s 
fu trace. Whereas in Hudfon’s-Bay, under an oppolite 
meridian, the eye of an obferver will be carried, while 
the Sun feems to move under the pole from fetting to 
rifing, in a diredion contrary to the motion of the ob- 
ferver s eye at the Ganges ; that is, in the direction of 
the planet s retrograde motion from eaft to weft . — From 
thefe conftderations, and fuppofingwithDr. Halley the 
axis of the planet’s path to be inclined to the axis of the 
equator in an angle of 2 0 . 1 8' only, the interval between 
the two contacts would have been 15'. 10" longer in 
Hud foil’s Bay than at the mouth of the Ganges. 
But upon examination the cafe is found to be fome- 
what different. T. he axis of the equator on the 6th 
of June 1761 rrtade an angle of 6° io' with the axis 
of the ecliptic on one fide, and the axis of the planet’s 
path an angle of 8°. 30'. 10" on the other; the 
axis of the planet’s path therefore made an angle with 
the equator of 14 0 . 40'. 10", — The planet’s latitude 
was 5 4. minutes greater both from obfervation and 
i"PP 2 the 
