[ 473 ] 
fairly therefore be concluded that the tranfpofition of 
the circles contributed very little towards giving fo 
different a refult, the reafon of which need not here 
be mentioned; and Dr. Halley feems to have been 
led into the miftake entirely from fuppofing the lati- 
tude of Venus to be about 4'. o" according to the 
tables, which he then ufed, conftruCted upon the 
principle that the nodes of that planet were fixed.— 
Having determined that the difference of duration 
at the two places above mentioned would be 1 . 10" 
(differing only 3" from the method I ufed which is 
independent of projection) the DoCtor proceeds to 
fhew, that if Venus had no latitude at the time of 
the middle of the tranfit, the difference would be 
1 S'. 40"; and if the planet fliould pafs 4 / .o // to the 
north of the Sun’s center, that difference would be 
21'. 40", and would become If ill greater, if the 
planet s north latitude fhoukl be farther increafed. 
And fuch would have been the event, had the mo- 
tion of the nodes been progreffive. But, agreably to 
the principles of univerfal attraction, their motion is 
really retrograde, and this Dr. Halley fays he himfelf 
fufpeCted, lit ob nuperas quafdam obfervationes fujpicio 
eft. And therefore it is fomewhat furprifing that he 
did not determine by calculation what would have 
been the difference in the whole duration between 
the two places, if Venus fhould pafs more to the 
fouthwardof the Sun’s center, then he had fuppofed. 
He would then immediately have perceived that the 
two ftations were not fo advantageoufly placed, as the 
folution of the problem required; 
Obfervers were therefore to be fentto other places, 
in order to determine the Sun’s parallax agreeably to 
the method propofed by Dr. Halley. The city of 
Tobolfki 
