PHYSICAL AND LITERARY. loi 



of latitude in A, WD another great circle ; 

 VB, V/^, arches perpendicular to WC, WD. 

 Then WA is a quadrant, and the fine of VA 

 is the par. Ion. D ^ * , whether the ftar has 

 latitude, or not : the fine of VB is the par. 

 lat. if the ftar be in the ecliptic; but, if it is 

 in the circle WD, the par. lat. will be the 

 iine of Vif ; which may be found from the 

 parallaxes of Ion. and lat. given for the ecli- 

 ptic place of the- ftar : thus. 



S,'WV = Cof. VA = s/R + par. Ion. X R— par. Ion. 

 " o VWR - R X S. VB (par, lat.) 



VW^ = VWB ^'^l C WD, if the lat # be ^ ^^^^^;^ 



e ,7/ 1 « ^ ^ - S, WV X S, VW^ 

 S, Vl = par. lat. D a # = — -'— 1 — 



1 8. Since the radius of the tables of fines 

 and tangents was all along taken for the ho- 

 riz. par. D <z or * j the parallaxes and 

 equation found muft be altered propor- 

 tionally. 



EXAM- 



