[ 3^7 ] 
Thus by the mean of 53 comparifons the Sun’s 
parallax is determined to be r= 8' , 58, and by the 
mean of 63 comparifons the Sun’s parallax is deter- 
mined to be — 8", 55. The mean of thefe two 
means gives 8 ", 565 for the parallax of the Sun on 
the day of the tranlit. 
It may be objected, that this determination cannot 
be depended on to a very great precilion, becaufe the 
greateft difference of the effedt of the parallaxes in any 
of thefe comparifons does not exceed 3' 31" : confe- 
quently that this is too fmall a bale, from which we 
can expedt any great exadtnefs in the determination of 
the Sun’s parallax : But if we confider the great num- 
ber of comparifons (no lefs than 116), the certainty 
of the differences of longitude of moft of the places 
of obfervation, and the fmall differences in the refults 
themfelves, I cannot help thinking that the force of 
this objection is in fome meafure removed ; and that 
this determination of the Sun’s parallax, by the ob- 
fervations at places on this fide of the Line only, 
muft be very near the truth. 
In order, therefore, to remove the force of this 
objedtion entirely, let us next confider the obfervati- 
on at the Cape of Good Hope, by which we fhall 
have a bafe very near three times greater than the 
former, and alfo the obfervation at Rodrigues, by 
which the bafe is nearly double of the former. But 
before I proceed I muff take notice, that, in the Me- 
moir, by M. Pingre, before mentioned, the time of 
the internal contadt at the egrefs at Rodrigues is fet 
down at o h 36' 49 // . But in the fame volume there 
is an account of M. Pingre s obfervation fent to the 
R. Academy before his arrival in Europe, and the 
V o l. LIII. T t time 
