prodibit: 



udti^-ltfdv — cdvcoC.XcoC.^-^ cvd\Citi.^,66t.9 



-i- cvdUoCXCin.^j ^^ 



ideoqiie 



^\l — mi X eo/. X i dv_Jin.\ ^ ^ ^„ v /tn.X _ ' pdXeof . A , dTjJi(^" 

 li' ~ u' • u^ u' "' u' 



- '^''^^^'{'iJdv-cdv cof.X cof. ^ -^ <^v</X firi. Xcof.^ 



f c-y^/^cof.XfinJ) 



— :^ (tt' cof X - f i; fin. V cor. f) ^^, ,. . , ^. ^ J '5 



Caeterum quia eft tang. X' — tang. X|^', per difFerentiatio- 



rem huius aequationis quoque differentiale ipfius X', per 

 difFerentialia ipforum 0, 1? et X dabitur, quod tamen mi- 

 rus commode fieri videtur, quam ifla ratione, quam mo« 

 do adhibuimus. 



§. 6. Vlterius fequitur vt disquiramus de valori- 

 bus difFerentialium d^, d X, d <v , per variationes in Eie- 

 mentis orbitae determinandis. Primum igitur quia eft 

 « — N-/-yi5 ent d^ — dli -d^f^ ideoque ex variabi- 

 litate in Longitndine Nodi confequimur d$ — ^N. Porro 

 quia efl ^ 



tang Tf— tang. (0 -t- 11) cof i, erit 

 ^.--di.Cm.i tang. ( (p + n ) ; 

 hincque 



d$z=-d7f — diCin.i tang. ( (p -j-n^foC^y^ 



— d i . tang. X cof. ?/, ob i^ ,n , 

 fin. i fin. (Cp-i- fl) - fin. X et cof. ((p+n) r cof. X cof. 57 , 



Nn 3 hinc 



