THE MOON S PARALLAXES. 32I 



weft of Greenwich ; but fubtract if the place be to the 

 eaft ; and the fum, or remainder, will be the apparent 

 time at Greenwich, 



2. To this time calculate the fun's right afcenfion in 

 time, and add it to the apparent time at the given place; 

 the fum is the right afcenfion of the meridian m time. 



3. From the latitude of the place by obfervation, 

 fubtract the correction taken from page LXXV of 

 Mayer's Tables ; the remainder is the latitude in the 

 fpheroid. 



4. Call the right afcenfion of the meridian in degrees 

 AR ; and, if the right afcenfion of the meridian be 



o 



& 90 "I then TAR -j- go "| isan f but 1 90 — AR "| is the 

 &270 J>inN.«j 270 — AR >Arc-j inS. J> AR — 90 \ Arc 

 &360J Lat. [AR— 270 J A. [ Lat. J 450— AR J A. 



5. Let half the fum of the colatitude of the place, 

 and the obliquity of the ecliptic, be called C, and half 

 their difference D ; then add the fecant of C, the co- 

 fine of D, and the cotangent of half A, together; the 

 fum (rejecting twice radius) is the tangent of an arc M : 

 then add the cofecant of C, the fine of D, and the co- 

 tangent of half A, together ; the fum (rejecting twice 

 radius) is the tangent of an arc N : then if the colati- 

 tude of the place be greater than the obliquity of the 

 ecliptic, the fum of M and N is an angle, whofe com- 

 plement call B ; but if the colatitude be lefs than the 

 obliquity, let the complement of the difference of M 

 and N be called B. 



6. Add 



