526 



PHILOSOPHICAL TRANSACTIONS. 



[anno 1768. 



comparing each of the two contacts of the Cape of Good Hope, and each of 

 the three contacts of Pekin, with all the other corresponding contacts. Also the 

 values of several of the letters or quantities, employed in the calculations, either 

 as given by the observations, or by astronomical tables, as follow: viz. d = 67° 

 18' 26"; H = 20". 6, supposing the sun's horizontal parallax 8". 2, which is used; 

 n = 57g".6; b = 83° 5l'; e = 81° 30'; the sun's diameter = 3l' 354-''; that of 

 Venus = 574-"; and the horary motion of Venus in her apparent path =4' 1". 



And the medium of all these means gives S".4Q for the sun's parallax. And if 

 we reject all the parallaxes which result from the comparisons of the Pekin ob- 

 servations on account of the uncertainty in the longitude of that place, there 

 will result for the sun's parallax 8".28, being the medium deduced from the ob- 

 servations made at the Cape of Good Hope. 



