"^^.i ) 498 ( §-c|<- 



'^ -'-/-;- 3 2=:CcofJ et '^^^ + lJ/zrefin.d, 

 ita vt fit C — — 1 et f — — |. lam ex pofteriore fit,. 



i|n-<rcof. ^-2Z-+-a, 

 hinque prior aequatio prodibit 



ill -\- Z — (C - 2 c) cofJ -i- 2 a.. 



Cum autem noftro cafu fit C — 2 <^ z::: o, habebimuj 



Hinc C vt ha^flenus ponatur 2=:i;cof. d, erit 



|fy?cof.$-'-^fin.0~2«, 

 et integrando 



tHL cof. ^* — 2 a fin. -4- j3 , vnde coUigitur 



hincque porro 



confequenter 



Zrr 2aH-j3fin. d-f-y co(! d , ex quo porro fit 



t? — — c cof. — 3a — 2pfin. 0-l-ay cof. d , 



vnde reperitur 



a~ — ^fin. d— 3aO-l-2|3 cof. — a y fin. d + J. 



§. 2 8. Cum hic motum medium rite conftitutum 

 cfte aflTumamus, necefte eft vt fit a — o, tum vcro etiam 

 dcbct ere (5" rz o. Quod autem ad conftantes p et y atti-» 

 net, quia etiam Aphelium rite conflitutum afl^umimus, debet 



etiam 



