[ 33 ° ] 
agit in planum orbis PN, per fimile ratiocinium quo 
ufi fumus in Prop. III. prodit acqualis c x fin. QN 
X % — jr> et motus interfedionis plani orbis P N 
cum piano orbis QN fit ~ — x fin. PN x fin. QN 
X P p quo tempore planeta P defcribit in orbe fuo 
arcum quam minimum P p. 
Deinde fi defignaverit D locum planetae P ubi ver- 
fatur in conjundione cum planeta interiore, et ponan- 
tur DP r= s, P/> — s', DN — a, et it PN rr; s -\- a y 
QN = s -}- -^-s a quamproxime, atque fin. PN 
X fin. QN ~ cofi —s — 4 - c °fi -f- •— s 2 a. 
Unde, calculum profequendo uti in propofitione 
tertid, motus nodorum fadus, quo tempore planeta 
P a loco conjundionis D difcedens defcripferit in 
orbe fuo arcum quemlibet D P, exprimetur per 
in 
a/ 3 
+ 
5-S 4-R — £ +- + 
2 n * kr * 2 n 1 * 
S+V r 2 
— fin. — s 
i n 
T + W r 3 , V + X 4 
fin. - j 4 - 
n 1 
fin. — s 4 -, See. 
n 1 
+ <pkn . r V i r i t 
-~r in Zxfin. — R — tt * — —fin. 2s\~s-\-ia 
2 r k 3 zn+ 1 « 
— - X — fin. 2s+2a~ - x- — — 
2 2 rt ‘ 2 2 « + 2 
— y 
2 2 n — i 
r 1 > T i 
fin. 2 s s +2 a x — — 
n 2 2« + 3 
fin. 2S — s 2a 
fin. 
i 3 » V i r 2 , 
s 4 s -X- 2a x fin. 2 s s 4 - 
' 1 2 2« — 2 rt * 
2 a 
