Theodosius <Bithynius>; Clavius, Christoph
,
Theodosii Tripolitae Sphaericorum libri tres
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<
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<
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<
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ſphæræ recta linea ducatur, erit hæc ad planum circuli perpendi-
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cularis, & </
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<
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">_IN_ ſphæra _A B C D,_ cuius centrum _E,_ ſit circulus _B G D H,_ a cuius polo _A,_
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per _E,_ centrum ſphæræ ducatur recta _A E,_ occurrens plano circuli in _F,_ & </
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ciei ſphæræ in _C. </
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">D_ico _A E,_ perpendicularem eſſe ad planum circuli, tranſireq́ per
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eius centrum, & </
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<
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">reliquum polum, hoc eſt, _F,_ eſſe eius centrum; </
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polum. </
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que _B D, G H,_ iungantur extrema cum punctis
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_A,_ & </
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">eruntq́; </
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_A G,_ ex definitione poli, inter ſe æquales; </
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non & </
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">_E B, E H, E D, E G,_ ſemidiametri ſphæ-
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ræinter ſe æquales. </
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gula _A B E, A D E,_ duo latera _A B, A E,_ duo-
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bus lateribus _A D, A E,_ & </
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habent æqualem; </
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æquales. </
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duo latera _A B, A F,_ duobus lateribus _A D, A F,_
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æqualia habent, anguloſq́ ſub ipſis contentos
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_B A F, D A F,_ æquales, vt proxime oſtenſum eſt.
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<
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">Quare anguli _A F B, A F D,_ æquales erunt, at-
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que adeo recti. </
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ctos eſſe angulos _A F H, A F G,._ </
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">_R_ecta igitur _A F,_ duabus rectis _B D, G H,_ inſiſtit
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ad angulos rectos. </
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">Quare perpendicularis erit ad planum circuli _B G D H,_ per re-
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ctas _B D, G H,_ ductum. </
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quum polum: </
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">ac proinde _F,_ centrum erit circuli, & </
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propoſitum. </
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ra tranſit, tranſire quoq; </
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">Nam ſi ex vno polo per centrum ſphæræ dia
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meter ducatur circuli maximi, qui per illum polum tranſit, cadet hæc in alterum polum,
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vt demonſtratum eſt. </
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<
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<
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<
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<
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">diameter ſphæræ, manifeſtum eſt, duos po-
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los circuli cuiuſlibet in ſphæra per diametrum eſſe oppoſitos: </
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poſitum eſſe ſemicircuium maximi circuli.</
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<
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<
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<
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<
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lirecta linea ducatur, cadet hæc in vtrumque polum circuli.</
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<
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