ASTRONOMY. 213 



KELYNE'S method of calculating the parallax from 

 the duration of the transit, is there given. 



See also on this subject, LA LANDE, Astron. vol. n. 

 liv. xr. 



225. From a mean of the observations of the 

 transit of 1769, taking it as calculated by SHORT, 

 EULER, &c. the parallax of the Sun, for his 

 mean distance, has been found to be 8". 7 3 ; and 

 the mean distance, therefore, -- 23659 semidia- 

 meters of the Earth, or 93595000 miles. 



VINCE, Astron. vol. I. 629. 



Thus the scale is determined according to which the 

 distances of the planets have been already set down, 



* 

 - 



SECT. 





