PHYSICAL anv LITERARY. 105 
which the parallel of the given place is 
projected, DF its greater axis, OM its 
feffer femiaxis, VG perpendicular to CO; 
MH, GK, perpendiculars to CW, and 
MI,GL, at right angles to CN; and, 
- for fhortening the rules, put CW, the fe- 
midiameter of the difk, or the horizon- 
tal parallel p 2 © equal to the radius of 
the tables of fines and tangents. 
8. For computing the parallaxes VA, 
VB, it will be convenient firft to fuppofe 
the fun in the meridian, and the place of 
the vertex at M; then to compute the va- 
Tiation of parallaxes for the given time 
from noon. 
9. THE meridian par. lon. D 4 © is MI 
or CH ; 3 and the meridian par. lat. > CO) 
is MH or Cl: For finding which the re- 
quifites are, dite 
a? 
of the lat. of the place, : To be found 
zt of the declination of the fun, ~ ‘ p from the 
cat § of PCN =complement of the merdian angle, | ae 
Vou. Il, ares . Oc 
