loo ESSAYS AND OBSERVATIONS 



of the fame ufe as in folar eclipfes, fubftitu^ 

 ting the Ion. * for the Ion. 0, and, for the 

 hour from noon, the equatorial diftance of 

 the ftar's ecliptic place from the meridian, 

 converted into time at the common rate of 

 15 degrees to an hour. 



16. If the ftar have latitude, then the 

 true Ion. and lat. ^ ^2 * are meafured by ar- 

 ches, from the center of the moon, perpen- 

 dicular to a circle of latitude, and to a great 

 circle at right angles to it, both paffing thro* 

 the ftar. Hence, 



As radius to cof. true lat. 8, fo tr. Ion. > 

 a "^ to the fame proiedied. And, 



As cof. tr. Ion. d a * to radius, fo tan, 

 tr. lat. I> to the fame projecfted : or, 

 without any fenlible error, fo tr. lat. K 

 to the fame projedted. 



17. To find the corredllon of the paral- 

 laxes fox the latitude of a ftar: let CW 

 (/ig. 2.) be the ecliptic on the earth's fur- 

 face, N its pole ; C N a circle of latitude 

 thro' the ftar ; W its pole ; V the given ver- 

 tex, CD, the lat. * ; WVA a great circle 

 thro' the vertex V, meeting with the circle 



of 



