titas 
XS 
I 
X 
u 
[ 300 ] 
tempus quo defcribitur arcus rp velocitate 
— T_J. His pofitis, quoniam planets Q_receffus 
a centro vel ad idem accefius pendet ex differentia 
virium, centrifugs fciiicet et eentripets, quibus urge- 
tur in li hsc differentia virium dicatur P, et v 
denotet velocitatem afcenfus vel defcenfus planets 
Q^fecundum radium SQ_, per idem plane ratioci- 
nium, quod mox ufurpavimus in inveftigatione velo- 
citatis U, habebitur v — P x 
X s 
u 
X 
Quoniam ex hypothefi planeta , fepofita acftione 
planets P, defcriberet circulum, vires (centripeta et 
centriluga) iibi invicem et unitati forent aequales : 
exiftente autem planeta Q_m r, ipfius attradio in 
Solem eft ex qua auferenda eft vis ea qua juxta 
* # 
propofttionem prascedentem diftrahitur a Sole, nimi- 
runi ~ in A 4- B cof. — s 4- C cof. — s 4- D cof. — s 
t * n 1 n 1 n 
E cof. ~ s -|-, &c. pofitis A — — — R, B 
XR 
1 2 k % ’ 
iT + k\V — 2V 
E 
C — 
IV + iX 
iS + /fV — 2 T 
2W 
D — 
, &c. atque ha- 
rum virium differentia componit vim centripetam. 
Vis autem centrifuga eft Temper in rationc dupli- 
eata ares temporis momento defcriptce direde et tri— 
plicatu diftantis inverse j unde fj hsc vis fuerit squabs 
