Theodosius <Bithynius>; Clavius, Christoph, Theodosii Tripolitae Sphaericorum libri tres

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            quid ad cæleſtem doctrinam pertinet, id omne
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            vel ſphæricis ex elementis, vel ex triangulorum
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            doctrina, vel ex arcuum denique chordis (vnde
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            omnis Sinuum, omnis linearum Tangentium ac
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            Secantium diſciplina manauit) peracute demon
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            ſtrat: </s>
            <s xml:id="echoid-s9" xml:space="preserve">vt fruſtra laborem operamq́; </s>
            <s xml:id="echoid-s10" xml:space="preserve">ſuſcipiat, quiſ-
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            quis hoc ſine præſidio Demonſtrationes illas
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            conetur attingere. </s>
            <s xml:id="echoid-s11" xml:space="preserve">Mitto quanta in Gnomoni-
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            ca, quanta in Coſmographia, Geodæſia, & </s>
            <s xml:id="echoid-s12" xml:space="preserve">vni-
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            uerſa pene Geometria earum rerum ſit oppor-
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            tunitas: </s>
            <s xml:id="echoid-s13" xml:space="preserve">ne aut in re perſpicua ſim multus, aut
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            aliena diſputatio videatur. </s>
            <s xml:id="echoid-s14" xml:space="preserve">Quocirca fatebor,
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            quod res eſt, Sapientiſſime Princeps, multas me
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            annorum vigilias ac labores pro eo amore, quo
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            ad Mathematicas voluptates incendor, in ea-
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            rum, quas dixi, rerum planam ac ſolidam cogni-
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            tionem contuliſſe: </s>
            <s xml:id="echoid-s15" xml:space="preserve">& </s>
            <s xml:id="echoid-s16" xml:space="preserve">lucubrationes quaſdam
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            ſepoſuiſſe, meos duntaxat in vſus. </s>
            <s xml:id="echoid-s17" xml:space="preserve">Verum vt
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            eruditorum, & </s>
            <s xml:id="echoid-s18" xml:space="preserve">eorum, qui ſcripta noſtra tracta-
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            bant, Gnomonica præſertim, vbi Sinuum, Trian
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            gulorum, cæterarumq́; </s>
            <s xml:id="echoid-s19" xml:space="preserve">rerum frequens incidit
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            mentio, poſtulationi concederem; </s>
            <s xml:id="echoid-s20" xml:space="preserve">commode
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            me facturum exiſtimaui, ſi quæ priuatos in vſus
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            temere collegiſſem, ea in ordinem adducta, & </s>
            <s xml:id="echoid-s21" xml:space="preserve">in
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            vnum quaſi coacta corpus in commune confer-
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            rem: </s>
            <s xml:id="echoid-s22" xml:space="preserve">Et commentarios hoſce in tres Theodoſij
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            Tripolitæ libros de ſphæricis elemẽtis, vna </s>
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