Biancani, Giuseppe, Aristotelis loca mathematica, 1615

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s id="s.002161">
                <pb pagenum="126" xlink:href="009/01/126.jpg"/>
              nam rectà recedat,
                <expan abbr="ſicq́">ſicque</expan>
              ; diameter Iridis E F, faciat angulos rectos cum
                <lb/>
              linea horizontali A C L, in quo ſitu oculo C, totus ex oppoſito directè ſpe­
                <lb/>
              ctaretur, non aliter ac Iridem ipſam conſpicere ſolemus. </s>
              <s id="s.002162">Quod autem ne­
                <lb/>
              ceſſaria ſit nubes roſcida, pulcherrima hac experientia
                <expan abbr="cõprobatur">comprobatur</expan>
              : ſi enim
                <lb/>
              in Sole poſiti ore aquam efflantes leui aſpergine aerem Soli, ac nobis ad­
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              uerſum irroremus, actutum Iridis arcum guttulis illis, quamuis volitanti­
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              bus inhærentem ſumma voluptate ſpectabimus. </s>
              <s id="s.002163">Quod præterea oculus no­
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              ſter, cum Iridem videmus, medius ſit inter Solem, & Iridis centrum, expe­
                <lb/>
              rimento diuturno, manifeſtum eſt.</s>
            </p>
            <p type="main">
              <s id="s.002164">Secundò, notandum eſt, arcum per reflexionem fieri: quod quidem pri­
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              mo eadem experientia, qua præcedens concluſio confirmatur: deinde, quia
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              Iridem ſemper in oppoſita Soli, ac nobis parte
                <expan abbr="cõſpicimus">conſpicimus</expan>
              ; quemadmodum
                <lb/>
              in eadem figura oſtenditur, quod aliter quàm per reflexionem fieri nequit.</s>
            </p>
            <p type="main">
              <s id="s.002165">Tertiò, ſciendum eſt ex Maurolyco, & 10. Baptiſta Porta, tantam eſſe di­
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              ſtantiam C D, ab oculo ad centrum arcus, quanta eſt altitudo, ſeu ſemidia­
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              meter D B, obſeruarunt enim ipſi angulos D C B, & C B D, eſſe ſemirectos,
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              & proinde æquales, & conſequenter duo latera C D, D B, trianguli C D B,
                <lb/>
              per 6. 1. æqualia ſunt.</s>
            </p>
            <p type="main">
              <s id="s.002166">Quartò, conſiderandum eſt lineas A B, A D, ob maximam Solis ab Iride
                <lb/>
              diſtantiam inſenſibiliter differre; & ideò ſupponi poſſunt æquidiſtantes,
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              quare angulus A B C, qui æqualis eſt alterno B C D, ſumi poteſt abſque vllo
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              errore pro ſemirecto. </s>
              <s id="s.002167">hic autem angulus A B C, dicitur angulus reflexionis
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              Iridis, ſub tali enim reflexione lumen Solis occurrens nubi in B, reflectitur
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              ad oculum C.</s>
            </p>
            <p type="main">
              <s id="s.002168">Quintò, ſequitur ex prædictis arcum videri ſemper ſub ſtato, ac determi­
                <lb/>
              nato reflexionis angulo, ſcilicet ſub ſemirecto,
                <expan abbr="neq;">neque</expan>
              poſſe per alium videri.
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              </s>
              <s id="s.002169">quod etiam probari poteſt ex Ariſt. quia nimirum videmus arcum apparere
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              conſimiliter in ambitu circulari, ergò neceſſariò apparebit
                <expan abbr="vbiq;">vbique</expan>
              in toto il­
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              lo ambitu per conſimilem reflexionem, ſiue per æquales reflexionis angulos,
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              pro quibus omnibus vnus cernitur in figura angulus A B C.</s>
            </p>
            <p type="main">
              <s id="s.002170">Sextò, ad Iridis viſionem, præter ea, requiri aeris rorantis multiplica­
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              tionem; ſicuti enim nebulam videre nequimus, niſi aer exhalatione illa in­
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              fectus multus ſit ante oculum noſtrum: ſic etiam exiſtimo ad Iridis appari­
                <lb/>
              tionem, opus eſſe plurima nube roreſcente, vt ex multiplicatione guttula­
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              rum, quarum aliæ poſt alias ſint, totus tandem Iris appareat. </s>
              <s id="s.002171">quia paucæ
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              guttulæ, etiam ſi quælibet illarum aliquid Iridis efficeret, ob paruitatem
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              tamen illarum, nulla arcus figura ſpectaretur. </s>
              <s id="s.002172">Quod ſi ante oculum pluri­
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              mæ ſint in toto aere aliæ poſt alias, tunc ſe mutuò iuuantes, obiectum ſatis
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              ſenſibile, quod Iris eſt, efficere poſſunt. </s>
              <s id="s.002173">Adde, quod etiam ex tali guttula­
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              rum multiplicatione, aer opacatur, quæ opacatio plurimum iuuat ad Iri­
                <lb/>
              dem ſpectandam.</s>
            </p>
            <p type="main">
              <s id="s.002174">Septimò, Iridis rotundationis cauſam ex præmiſſis conſtare potiſſimum
                <lb/>
              ex duabus. </s>
              <s id="s.002175">primò, ex angulo reflexionis determinato, qui videlicet ſit ferè
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              ſemirectus. </s>
              <s id="s.002176">ſecundò, ex paribus diſtantijs C D, D B, huiuſmodi enim plures
                <lb/>
              anguli, qui ad Iridem ſunt neceſſarij (debent enim ſingulæ Iridis partes ſub
                <lb/>
              huiuſmodi angulo repreſentari) non poſſunt aliter quàm in gyrum
                <expan abbr="cõſtitui">conſtitui</expan>
              </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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