262 
) o ( 
m 
pen’s fingatur incipere in apfide ubi angulus pro- 
jedionis eft reftus. 
§. 4. 
Refumamus jam aequationem noftram diffe- 
rentio - differentialem ddv -f- vdz '^ — - 
f 
V 
4>- 
irdv 
vdz' 
g 
v‘ 
1-1-2/ 
T:d': 
0^ eaque conjiciatur in feriem 
b 
(tfd 
X) ■ 
infinitam , quare prodibit ddv -h 
gg 
2 (pd 
rr Î 
V-gg v^gg 
Trdz Trdvdz A0dz^ 
/Tr-+ TTT- 
i^’gg 
-f- &c.-= 0 , quæ eo celerius converget , quo mi- 
nor eft vis TT, Ex fola infpeOiione hujus aequa- 
tionis differendo -differentialis, quæ in genere ex- 
primit naturam curvæ deferibendæ a corpore quo- 
vis ad duo centra virium follicitato, five quælfio 
efi: de motu Lunæ ad Tellurem & Solem ateraftæ, 
five de modbus planetæ cujuslibet ad Solem & a- 
lium quemvis planetam attraefi, conflat iilam non 
elle formæ propofitæ d dt -\^N^tdz^ \'\dz^~o^ 
verum niulto magis compofitam , ideoque hanc 
uldmam tequationem non nifi per multifariam re- 
flriclionem dici pofie æquadonern difierendo-diife- 
rentialem trium corporum , iilarnque nullo modo 
applicari, fi orbita effet admodum ovalis, & vires (pSi 
TT magis accederent ad aequalitatem , quæ tamen u- 
,traque conditio feliciter in motibus neque Lunæ ne- 
que 
