(130 

 tione pro Cm (§. 3.) ponatur Cp^— o, ct z'' — 1 ; unde fit 



/-* _ a zjin. p-" 



^' •^ a -h co/. p' * 



§. 5. Inter ellipfes , quflrnm axes transverfi fiint id 

 lineam q n perpendiculares, feu quarum latitudo maior ell lati- 

 tudine Zenith, illa, quae polo efl: proxima, maxime a circuio 

 difFert. Pofito nempe 5;'' zz: - — ^ , et Cp'' rz: 90" , evancrcit 



quidem axis uterque a et p , at fit 



L_ m L_ 



<^ zCm.a^-^-l- w/ 2; fin. p^ -f- I 



(§. 4.), qui igitur efl: limes rationis , ubi axes evanefcunt. 

 Sin autem ponatur Cj)'' — A C D ~ — P'' , ob z'' zzzz .^ fit 

 P^ zr ° ; at 



oa o 



UU~ ir-^cof.^^pi.-r) t(2 0L~t)— 00; 



pofito vero Z — o, erit uuzrz°l indeterminatum ; unde patet, 

 Parallelum , qui ad oppofitam partem tantundem ab Aequa- 

 fore diftat ac Zenith , proiici in lineam reftam, quae in pundo 

 d lineam q n normaliter fecat , fiquidem abciflae t a pundo d 

 computantur : prorfus ac in proiedione fphaericai Eiusmodi 

 enim Parallelus per pundum O necefliirio tranfit , fiquidem 

 affumitur O C R — |3''. Ceterum eft C r/ — a ~ tang. p^ : eft 

 enim DCZzr2|3^=2COD, obCDrzasnrCO, et 

 C dzzzC O t^n^. C O d. Idem fequitur e formula pro Cm 

 generali , quae hocce cafu fit 



H-co/.ap' i^col.^li-JmJJ' ^ ~ ""&' P * 



Perfpicimus denique , C ;;/ ~ ° «-"/'"• '3 ~^'_ fieri neeatiuam . 

 feu integram ellipfin ad dextram pun(fli C partem cadcre , fi 

 CP >> (3. Sin autem angulus (J) fit negativus , atque (|) > |3 , 

 ^ ^* ~ rJ^'%%t%\ ^^ flegativa , h. e. integra ellipfis cadit 



R 2 fini- 



