MOTUS MEDII PlANETAKUM. 23 



XXVIII. 



Jam partis prions integrale eft 



pro parte autem pofteriori ponamus brevitatis gratia 



cof. £ cof. (9 — 4) ■+* fi n - £ co f- <*fi n - (8 — 4) = co f- P > & 

 fin. £ cof. (8 — 4j — a?/ 1 cof. a fin. (9 — 4) = fin. v , 

 ut fit p= angulo Qy^Z 8c propterea 



T = V / («« 2KV co/^ p -i- v v). 



Hincque a:quatio noftra integralis ita fe habebit 



V d V 



•+■ i a. C d t 1 f(d v cof. p — v d § fin. a) (71 — — Y 



Turn vero ex fupra inventis habemus : 



v * d <p l = — a a. C d t z f v 3 d q> fin. a (71 — ^} 



quibus duabus squationibus folutio problematis potif- 

 fimum continetur. 



XXIX. 



Ponamus preterea ad has formulas contrahendas : 

 fvtdvfin.o^-^^P; 



f{dvcof. ? — vd$fin.<r) ( T ~, — ~) =Ri 



quas quantitates , quia in terminis valde parvis tantum 

 infunt , tantifper tanquam cognitas fpe&emus : Sc nof- 

 ttx aequationes erunc 



