Theodosius <Bithynius>; Clavius, Christoph
,
Theodosii Tripolitae Sphaericorum libri tres
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ex eiſdem polis A, B, ad interualla AC, BC, delineentur circuli non maxi-
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mi KCN, OCP, qui prioribus erunt paralleli. </
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<
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culo communibus ſectionibus horum circulorum cum circulo ABGF, quæ
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inter ſe parallelę erunt, ſeſeq́; </
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<
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<
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xml:space
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polo circuli BF, in ſphæræ centrum X, cadens ad ipſum circulum recta eſt;
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ac propterea, ex defin. </
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<
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<
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<
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angulos ad R, S, Y, rectos eſſe, ob parallelas lineas BF,
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N, & </
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AV, ſinus rectus quadrantis AB; </
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Y, ſinus rectus arcus AC, ſiue arcus AK,
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illi, ex defin. </
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poli defin. </
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Q, ad BF, perpendiculari) ſinus verſus ar-
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cus
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, quo arcus AB, AC, inter ſe differunt; </
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S, ſinus verſus ar-
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cus
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C. </
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cui
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C, ſimilis eſt, demonſtrabimus, vt in primo caſu, ita eſſe quadratum ſi-
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nus totius, nempe rectangulum ſub DX, XA, ad rectangulum ſub AV,
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Y,
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ſinubus rectis arcuum AB, AC, vt eſt DZ, ſinus verſus anguli A, ſiue arcus
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BL, ad
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T, ſiue ad QR, differentiam ſinuum verſorum BR, BQ, arcuum
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BC,
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, niſi quòd hic non inueniuntur triangula æquiangula, ſed AV, ab
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XA, non differt, quemadmodum nec
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S, à
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T.</
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<
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Completo circulo ABGF, & </
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ex polo A, ad interualla AE,
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AC, circuli BEF, KCN, & </
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polo B, ad interuallum BC, cir-
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culus AEG, aliaque fiant, vt in
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præcedenti caſu. </
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ergo, vt in primo caſu, ita eſſe
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quadratum ſinus totius, hoc eſt,
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rectangulum ſub DX, XA, ad re-
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ctangulum ſub AV, KY, ſinu-
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bus rectis arcuum AB, AC, vt
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eſt DZ, ſinus verſus anguli A, ſi-
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ue arcus BE, ad KT, ſeu QR, differentiam ſinuum verſorum BR, BQ, ar-
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cuum BC, BK, niſi quod hic nulla adſint æquiangula triangula, quemadmo-
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dum nec in præcedenti caſu, atque AV, ab XA, & </
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non differt.</
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<
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etiam quadrante. </
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culo ABGF, & </
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tibus AL, BM, ex arcubus AC,
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BC, deſcribantur circuli ex po-
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lis A, B, ad interualla quadran-
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tum AL, BM, & </
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<
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BC, cæteraq́ue fiant, vt in præ-
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cedentibus. </
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<
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in primo caſu demonſtratum eſt,
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ita quadratum ſinus totius, id
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eſt, rectangulum ſub DX, XA,
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ad rectangulum ſub AV, KY, ſinubus rectis arcuum AB, AC, vt eſt </
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