C 301 ] 
r, ubi incepit planeta movere in C, erit acqualis 
X U 1 x -y = — X ubi movetur in r. 
X iX SC X-. 
Differentia igitur inter vim centrifugam et centri- 
petam, qua urgetur planeta in r fupra defignata 
per P, eft — x — d — -b- 4- — 
1 XX X 1 t 3 
X A B cof. — s 4- C cof. — s 4- D cof — s 4-, &c. 
n ' n 1 n 
bincque habetur v — i x — — U — - 4 - -A 
X I t* 
XX U 
X 
X 7 X A 4- B cof. — s 4- C cof. — s 4-, &c. 
4 tj 1 n. 1 n 1 
Vires,, quibus perturbatur motus pianette Q_, cum 
exprimantur feriebus quorum termini ducuntur in. 
finum vel cofinum anguli r, vel anguli, hujus mul- 
tiplicis, fingemus differentiam inter diftantias S et 
Sr exprimi ferie iimili, ac propterea 'ponemus x 
t — Q_-f K cof. —s 4- L cof. — s 4- M cof. — s . 
4" N- cof. ~ s, &c. exiftente Q — K L -j- M' 
4 " N 4 "> &c. ut fit Sr, five x = i, ubi planetae: 
Q^et P incipiunt movere a linea conjundtionis SCD... 
Quantitates autem aftumpta; K, L, M, &c. funtexi- 
gu«, ideoque ecit ~ =r i 4 . Q^- K cof ~s. — L, 
cof - — M cof -b-r — N cof , &c. quam^ 
groximei. 
