SOLSTITIORUM MOMENTIS. .9 



Exiadc porro conficitur tangcns arcus DE (pcr 



/-+-'r . tx-i-mr 

 5». 8.)— 7 ■ ./•— r Z — Eadeni vcro 



1 X ' 



tangcns invenitnr per priorem nnalogiam , hoc mo- 



do : .V : /"« : '^'k— tang. arc. DE. 



Formctiir ergo xqiiatio ct reducatiir 



■^=^^.'- nndc fit 



^ '. .\ , 



H.vc reguia invcnitur cotangens anguli ad A; 

 ncc adco difTicilis efl: cxecutu , uti videri poflef, 

 oftendim flio tcmpore exemplis, quomodo per Ib- 

 los logarithmos efiici poflit. 



10. Nunc ad propofitum revcrtar : Reprae- 

 fentct in priori fchematc arcus AF xquatorcm-, ar- 

 ciis ABD ccliptic:\ni •, Anguhis ad A fit obliquitas 

 cclipticx , ct arcus BC , DE, fiiu dux divcrltc dccli- 

 nationes folis. Per fuperiores obfcrvationcs inno- 

 tefcunt afcenfioncs rcOix folis tam a (tclla ( §. 3. ) 

 quam a principio arietis ( §. 5. ) dantur ergo arcus 

 AC et AE. Porro ( per §. 2. ) dantur quotidianas 

 folis altitudincs maximx , carumquc diftcrcntix* •, hx 

 vero diflfcrentix funt fimul difFcrcntioe declinatio- 

 num fularium •, crgo per obfcrvationes easdem no- 

 tus fit arcusDH, ex quibus omnibus elicitur anguhis 

 nd A , fivc obliquitas eclipticic. ( pcr §. p. ) Q. E. J. 



11. Omnia, puto, phina forent, modoar- 

 cuhis DH rcfradionibus obnoxius non cflet : Difpi- 

 ciam crgo quantum rcfradioncs valcant in hunc ar- 



D 3 cum 



