Theodosius <Bithynius>; Clavius, Christoph
,
Theodosii Tripolitae Sphaericorum libri tres
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maximi ſunt, qui per ſphæræ centrũ ducũtur, &</
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ræ ad centrum circuli connectatur recta linea, con
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nexa linea ad circuli planum recta erit.</
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<
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E: </
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circuli B F C G. </
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lo, ducantur ab earum extremis ad D, centrum ſphæræ rectæ lineæ, B D,
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C D, F D, G D, quæ omnes inter ſe æqua-
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les erunt, cum à centro ſphæræ ad eius ſuper
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ficiem cadant: </
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G E, ſemidiametri circuli B F C G, æquales.
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tera D E, E B, duobus lateribus D E, E C,
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& </
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quo fit, angulos D E B, D E C, æquales, at-
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que adeò rectos eſſe. </
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B C, ad rectos inſiſtet angulos. </
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oſtendemus, rectam D E, rectæ F G, ad re-
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ctos angulos inſiſtere. </
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no circuli B F C G, per rectas B C, F G, du-
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cto ad rectos angulos inſiſtet. </
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dendum erat.</
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circulũ ducatur perpendicularis, quæ ad vtramq;
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cuius centrum E, ſit cir-
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culus B G D H, in cuius
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planum à centro ſphæræ
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E, per pendicularis dedu
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cta ſit E F, quæ in vtram-
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que partem protracta ca
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dat in ſuperficiem ſphæ-
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ræ ad puncta A, C. </
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A, C, polos eſſe circuli
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BGDH. </
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pendicularis E F, in </
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