PER SEGjIENTA SPHAER. SPECT. I9P 



IL De Arpe£lj coeli per (egmenta 

 diaphana fpliaerica cafuquo d=L 



2.1. Loco ig;tur ociili O intni fphacram af- Fig. 

 fumto , vt fit ^— ^, feu CB:CO in ratione re- 

 fractionis «:i, afpccflum coeli pcr ambo fegmenta 

 fimul definire licct. Pro minore fcilicet fegmento , 

 pofito angulo apparente EOV— Cj), cum fit fin.<^ 

 — fin.cp ct fin.-v]— ^fin.cp, ideoque «^zzCf) angulus 

 ab axe verus EOS erit n;2Cp — v). Pro maiore 

 autem fegmento pofito angulo apparente FOV — v{y 

 ob fin.i^rr fin. vjv ideoquc <^~\p et fin.-vi ~ ^fin.vj/, 

 erit angulus ab axe \erus ¥Os~\i/ — ^+y\~y\.,\ndQ 

 •idem calculus, quoanguli "vi dcterminantur, vtriusque 

 fegmenti phaenomena patefaciet , etiamfi ea non con- 

 tinuitatis lege inter fe cohacreant. Calculum ergo' 

 hunc pro vitro quo «—1,5467 inft.tuamus 

 23. Pro vitro et fegmento minore 



ang. veruf 

 EOs 



ang. ap. 



EOV 



.0 



an 



xo 



15 



20 



30 

 35 

 40 

 45 



verus 

 EOx 



;, 46, II 



»3, 33, 14 



20, 22, I 



27, 13, 29 

 34, 8, 34 

 41, 8, 21 

 48, 13, 57 

 55, 25, 37 

 ^2> 47, 43 



70, 18, 43 



78, I, 14 



85, 56, 59 



' 94, 7, 44 



102, 35, »5 



III, 21, 13 



120, 27, 9 



129, 54, 12 



139,43, 8 



Pro 



