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

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          <p style="it">
            <s xml:id="echoid-s8636" xml:space="preserve">
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            quin{que} libris diffusè explicatam, & </s>
            <s xml:id="echoid-s8637" xml:space="preserve">à Gebro Hi-
              <lb/>
            ſpalenſi Arabe, necnon à Nicolao Copernico bre-
              <lb/>
            uiter quidem, ſed paulò obſcurius traditam, pro
              <lb/>
            virili etiam exponamus, cum incredibilis ſit eo-
              <lb/>
            rum vtilit as cum in rebus omnibus Mathema-
              <lb/>
            ticis, tum præſertim in cæleſtibus motibus, & </s>
            <s xml:id="echoid-s8638" xml:space="preserve">in
              <lb/>
            ijs rebus, quæ ex illis pendent, rectè intelligendis,
              <lb/>
            velinueſtig ãdis, vt dictum est, & </s>
            <s xml:id="echoid-s8639" xml:space="preserve">partim etiam
              <lb/>
            non obſcure ex noſtra Gnomonica colligi poteſt,
              <lb/>
            vbi permulta ad horologia pertinentia ex trian-
              <lb/>
            gulis à nobis ſunt demonſtrata. </s>
            <s xml:id="echoid-s8640" xml:space="preserve">Exordiemur
              <lb/>
            autem à triangulis rectilineis, tanquam facilio-
              <lb/>
            ribus, de quibus eaſolum demonſtr abimus, quæ
              <lb/>
            ad res Aſtronomicas, & </s>
            <s xml:id="echoid-s8641" xml:space="preserve">Geometric as recte per-
              <lb/>
            cipiend as neceſſaria eſſe iudicamus: </s>
            <s xml:id="echoid-s8642" xml:space="preserve">Id quod e-
              <lb/>
            tiam in ſphæricis triang ulis obſeruauimus. </s>
            <s xml:id="echoid-s8643" xml:space="preserve">Qui
              <lb/>
            plur a deſider at, leg at Menelaum, & </s>
            <s xml:id="echoid-s8644" xml:space="preserve">Mauro-
              <lb/>
            lycum de sphæricis triangulis, de rectilineis ve-
              <lb/>
            ro Ioannem Regiomontanum. </s>
            <s xml:id="echoid-s8645" xml:space="preserve">Ante omnia au-
              <lb/>
            tem explicandum erit, penes quid angulorum
              <lb/>
            rectilineorum quantitas ſumenda ſit.</s>
            <s xml:id="echoid-s8646" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s8647" xml:space="preserve">PENES QVID ANGVLI rectilinei magnitudo ſumatur.</s>
            <s xml:id="echoid-s8648" xml:space="preserve"/>
          </p>
          <note position="left" xml:space="preserve">Angulorũ
            <lb/>
          rectilineo-
            <lb/>
          rũ magni
            <lb/>
          tudo penes
            <lb/>
          quid ſuma
            <lb/>
          tur.</note>
          <p style="it">
            <s xml:id="echoid-s8649" xml:space="preserve">ANGVLI cuiuſuis rectilinei magnitudo ſumitur penes arcum circuli ex ipſo
              <lb/>
            angulo, vt centro, deſcripti ad quodcunq; </s>
            <s xml:id="echoid-s8650" xml:space="preserve">interuallum, inter rectas lineas angulum
              <lb/>
            comprehendentes interceptum. </s>
            <s xml:id="echoid-s8651" xml:space="preserve">Nam quilibet angulus rectilineus tantus eſſe dicitur,
              <lb/>
            quantus eſt arcus circuli, cuius centrum eſt inipſo angulo, inter duas lineas </s>
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