PHYSICAL ano LITERARY. 103 
difference of the vif. lon. » 2 © obferved at 
Vand C: But the vif. long. y2© obferved 
at C, is the fame as if feen from A; there- 
fore the par. lon. DZ © is equal to the dif. 
ference of the vif. long. ) 4 © obferved at 
V and A, which is equal to the arch v a 
the meafure of VA. In like manner, VB 
may be proved to be the par. lat. )40; 
the vif. lat, being the fame when obferved 
at Bor C. 
_ g.In any other pofition of the moon, 
af its diftance from the point v exceeds 
not one degree, which it can never do in 
the time of an eclipfe; the parallaxes, to 
a {peGator at the point V of the dilk, will 
continue nearly the fame as before, with- 
—outiany fenfible alteration. Let / be the 
place ‘of the moon, /d,/f, perpendiculars | 
tocn,¢e;and let fl, v a, be produced till 
they meet in the point g¢ ; and let /d meet 
with vb in the point ¢; the vif. lon. pa 
©, will be nearly the fame at the points ¢ 
and /, Therefore the vif. long. ) 2, ob- 
ferved at V, is the angle under which the 
arch vg is feen from that point. But the 
arch vg will be feen nearly under the 
fame 
