X38 DE CALCVLO MOTVS 



IX. 



DLUidc obfcnKuidiini clt , augmentuni nrgu- 



inciUi l-.ititudiiiis (j promotioni in propriti orbita 



lcu clcmcnto d^ non eflc aequnlc , nili linea nodo- 



rum mancat immota ; cum inucncrimus dazzd^ 



— /-/vjyconw, folo cxccpto cafu , quo inclinatio u 



Tab. II. foret angulus rcdlus. Haec vcro phacnomcna pcr 



*■'&• 3- {•rigonomctriam fphacricam magis pcrfpicua rcdden- 



tur. Si cnim circulus BNY \t ante rcpra^fcntet 



planum fixum, ad quod motus pundi Z rcfcrtur , 



ciusqne motus pracfens fiat fccundum circulum NZ, 



Yt fjt BN— \]y, YNZ=:^ ct arcus NZ = cr; 



at poftquam punclum Z pcr clcmcntum "Lzzzzd^^ 



fucrit progrcfUim , cius motus fuit lccundum circu- 



lum ;?~, crit promotio lincac nodorum ^n~d^ 



inclinatio variata Ywsznw-l-rt^u, et argumcntum 



latitudinis nzizi^-^-da-. Viwdo crgo arculo nv ad 



NZ normali erit Nj^rr^vpcofu ct //vnrt^v^fm.oo; 



indc autcm coHigitur Z« — o" — r/^^^^cof u, idcoquc 



«s^cr — rt^x^/cof oj-f-//Cprzcr-f-rt'o- et confcqncntcr 



r/cr — r/Cj) — «'vjycof w vt ante; fimul autcm intclligi- 



jnws ob rt^vl^cof cj.— r/CP— r/crzr.Ni', formuhun ^/(J) 



■—da- cxhibcrc promotioncm lincac nodorum in pro- 



pria orbita , quia cum nodus fuilfct in orbitac NZ 



pundo N ^ is iam in cius pundum n (cu v cflct 



transhuus. Praetcrca ex trianguh) fphacrico N;;Z 



coUigimus : 



in\. oj : fin. (oj -f- </oo) — fin. (o" — d<^ cof. w) : fin. cr 



