[ 423 ] 
But the integral of ff x 
d si 
V X X ZZ * 
d Z . ff X 7 r f f 7 r 
===== is — X — — , 
— ~ — , when we take 
V xx. — ■ ,£.3 JC 2 2 
all the points / * from l 1 to /j and the integral of 
which is — 2; v/xx — ££ + fdz 
V XX — ZZ J 
V xx — ZZ} when, after the in tegration, we make 
or the area of 
.... 
A, A, 
is = 
x 7 r 
' 2 X 2 4 
• wT" /V - 
Therefore the integral of B x — x^-2. x yy_ 
27T dCC 
dz . D nT fg fffir 
; — ■ — IS = B x — * x x ' 
Vxx — 2?r 
zt 
^ ff 7T XKt J 
2 acc v 2 4 y 2 2 a c 
cc 
This is the fum of all the inftantaneous precef* 
fions for all places of the lunar orbit from / to /% be- 
caufe we have always taken two points together placed 
on either fide of l\ 
And this is the quantity of the preceflion with re^ 
gard to the ecliptic, during the time of a femi-revolu- 
tion of the lunar orbit. Which was to be found. 
"\ 
Pro* 
