Casati, Paolo, De igne dissertationes physicae, 1686

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              <pb o="176" file="0604" n="604" rhead="Diſſertatio Quinta."/>
            ardentis, tum obiecti Solis lumen recipiunt, quod ad nos refle-
              <lb/>
            ctunt, augent apparentem Cometę magnitudinem limbum
              <lb/>
            conſtituentes, & </s>
            <s xml:id="echoid-s19643" xml:space="preserve">trajectam Solis lucem validiùs refringentes
              <lb/>
            aliquando uniunt, aliquando diſpergunt, variamque tribuunt
              <lb/>
            ipſi caudæ figuram, ratione tum longitudinis tum latitudinis.
              <lb/>
            </s>
            <s xml:id="echoid-s19644" xml:space="preserve">Quoniam verò contingere poteſt, ut halitûs illi refractorii ſe-
              <lb/>
            cundùm diverſas ſuperficies Solis radium aut directè aut obli-
              <lb/>
            què recipientes ita ſint poſiti, ut alii lucem rectâ dirigant, alii
              <lb/>
            illam aliorſum inflectant, etiam cauda ſinuata apparebit, atque
              <lb/>
            ſive ſurſum, ſive deorſum curvata. </s>
            <s xml:id="echoid-s19645" xml:space="preserve">Ex his demum halituum
              <lb/>
            compactorum faciebus diverſis cauſa redditur, cur aliquando
              <lb/>
            cauda brevior ex improviſo ſtatim longior appareat etiam
              <lb/>
            cum vibratione; </s>
            <s xml:id="echoid-s19646" xml:space="preserve">quia nimirum halitûs illi commoti & </s>
            <s xml:id="echoid-s19647" xml:space="preserve">agitati
              <lb/>
            diverſas facies Soli obvertunt, exceptoſque radios longiùs pro-
              <lb/>
            jiciunt, ſuòque motu vibrationem efficiunt.</s>
            <s xml:id="echoid-s19648" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s19649" xml:space="preserve">Grad. </s>
            <s xml:id="echoid-s19650" xml:space="preserve">Nimis operoſum eſſet ſingula Cometarum, qui ali-
              <lb/>
            quando viſi ſunt, phænomena conari explicare, prout ab Hi-
              <lb/>
            ſtoricis tradita ſunt; </s>
            <s xml:id="echoid-s19651" xml:space="preserve">multa quippe ex vulgi rumoribus ſępè
              <lb/>
            acceperunt, necipſi teſtes ac ſpectatores fuere: </s>
            <s xml:id="echoid-s19652" xml:space="preserve">ideò plenę voca-
              <lb/>
            bulorum notioni aliquid non rarò demendum cenſeo. </s>
            <s xml:id="echoid-s19653" xml:space="preserve">Sic apud
              <lb/>
            Juſtinum lib. </s>
            <s xml:id="echoid-s19654" xml:space="preserve">37. </s>
            <s xml:id="echoid-s19655" xml:space="preserve">de Mithridate ſcribentem legimus. </s>
            <s xml:id="echoid-s19656" xml:space="preserve">Hujus igi-
              <lb/>
            tur futuram amplitudinem etiam cœleſtia oſtenta prædixerant. </s>
            <s xml:id="echoid-s19657" xml:space="preserve">Nam
              <lb/>
            & </s>
            <s xml:id="echoid-s19658" xml:space="preserve">quo genitus eſt anno, & </s>
            <s xml:id="echoid-s19659" xml:space="preserve">quo regnare primùm cœpit, ſtella Cometes
              <lb/>
            per utrumque tempus ſeptuaginta diebus it a luxit, ut Cœlum omne
              <lb/>
            conflagrare videretur. </s>
            <s xml:id="echoid-s19660" xml:space="preserve">Nam & </s>
            <s xml:id="echoid-s19661" xml:space="preserve">magnitudine quartam partem cœli
              <lb/>
            occupaverat, & </s>
            <s xml:id="echoid-s19662" xml:space="preserve">fulgore nitorem Solis vicerat, & </s>
            <s xml:id="echoid-s19663" xml:space="preserve">cum oriretur, occi-
              <lb/>
            deretque, quatuor ſpatium borarum conſumebat. </s>
            <s xml:id="echoid-s19664" xml:space="preserve">Quę verba niſi
              <lb/>
            benignâ interpretatione mitigentur, hyperbolem ſapiunt: </s>
            <s xml:id="echoid-s19665" xml:space="preserve">quis
              <lb/>
            enim credat fulgore ſuo Cometam viciſſe nitorem ſolis, quaſi
              <lb/>
            Sole lucidior fuerit? </s>
            <s xml:id="echoid-s19666" xml:space="preserve">ſed leniri poteſt ſignificatio verborum, ſi
              <lb/>
            interpretemur eam fuiſſe Cometæ lucem, ut à diurno Solis
              <lb/>
            ſplendore non obtunderetur, quin conſpicua eſſet. </s>
            <s xml:id="echoid-s19667" xml:space="preserve">Etenim
              <lb/>
            Seneca lib. </s>
            <s xml:id="echoid-s19668" xml:space="preserve">7. </s>
            <s xml:id="echoid-s19669" xml:space="preserve">cap. </s>
            <s xml:id="echoid-s19670" xml:space="preserve">20. </s>
            <s xml:id="echoid-s19671" xml:space="preserve">ait, Multos Comet as non videmus, quòd obſcu-
              <lb/>
            rantur radiis Solis; </s>
            <s xml:id="echoid-s19672" xml:space="preserve">quo deficiente quendam Cometem apparuiſſe,
              <lb/>
            quem Sol vicinus obtexerat, Poſſidonius tradit. </s>
            <s xml:id="echoid-s19673" xml:space="preserve">Quòd verò Cœlum
              <lb/>
            omne conflagrare videretur, utique dictum per vulgarem au-
              <lb/>
            xeſim, ad ſignificandam ingentem flammam, quam imitabatur
              <lb/>
            cauda ad gradûs 45. </s>
            <s xml:id="echoid-s19674" xml:space="preserve">exporrecta, adeò ut tanta longitudo ex
              <lb/>
            horizonte obliquè aſcendens, & </s>
            <s xml:id="echoid-s19675" xml:space="preserve">infrà illum obliquè deſcen-
              <lb/>
            dens quatuor horarum ſpatium abſumeret.</s>
            <s xml:id="echoid-s19676" xml:space="preserve"/>
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