[ 43 ° ] 
2q.' By Art. 8. A = — x - ~ a - = (by Articles 
7 s 3 m l — 2a 
>o\ 2 tt 7t a<2 3 ^ a 
27. 28.) 3 x = ^x 7T x 
x 2a7r 1 — 2a Tf ‘ 1 — 2a 
2 t 
= (by x 4 r/. 3 1. following) r ^— x tt x -rfo-. 
1 X 
30. Putting q for the ratio of the lunar force — 
S L S 
to the folar force we fliall have — , = - x q ; and 
JB, which (byx^r/. 16.) is = 3 -^ x will alfo be 
A 3 m 1 — 2a 
3 (S’ a # 
: £_ X y x = 
s m 1 — 2 a 
3 1 . Suppofing a 
(by Art. 29.) |^,x 7r x 
, which is conformable to 
178 
the obfervations of the gentlemen of the Parifian aca- 
*1 II 
demy, we Hi all have = = . 
1 — 2a 0 2 176 
I78xi -T7s 
Problem XI. 
, f 
32. To find the precefiion caufed by the fun during 
the time between the equinox and the folfiice ; that is 
to Jay , in a quarter of a year y or three months. 
By Art. 12. the precefiion, during this time, is 
T jr 
A by. ~x — . Putting, inftead of A y the value 
1 4 r 
found 
