326 A METHOD OF CALCULATING, &C. 



the fum (rejecting twice radius) is the logarithm of the 

 parallax in latitude corrected. 



3. Add the logarithm of the parallax in latitude cor- 

 re6ted, the fine of P, and the tangent of the altitude of 

 the nonagefimal degree, together; the fum (rejecting 

 twice radius) is the logarithm of the parallax in longi- 

 tude. 



Scholium. The method of applying the parallaxes 

 ufually given, requires no other correclion than the fol- 

 lowing. When the pole of the ecliptic of the fame 

 name as the latitude is under the horizon, to the cotan- 

 gent of the altitude of the nonagefimal degree add the 

 cotangent of the moon's latitude; the fum is the cofine 

 of an angle ; which added to, and fubtracled from, the 

 longitude of nonagefimal degree, give two longitudes, 

 between which the moon's latitude of a contrary name 

 to the elevated pole is to be increafed for the apparent 

 latitude ; but beyond thofe longitudes the moon's true 

 latitude is to be increafed by the parallax in latitude 

 to have the apparent latitude. 



REMARKS 



