Casati, Paolo, De igne dissertationes physicae, 1686

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            <s xml:id="echoid-s18580" xml:space="preserve">
              <pb o="148" file="0576" n="576" rhead="Diſſertatio Quinta."/>
            thematicos) judicium ferre de illorum argumentationibus, an
              <lb/>
            planè Geometricam ſubtilitatem aſſequantur, ad apodicticas
              <lb/>
            tamen ratiocinationes tam propè accedunt, ut longè probabi-
              <lb/>
            lius ſit Cometas aliquos ultra lunaris Cœli terminos fulſiſſe.
              <lb/>
            </s>
            <s xml:id="echoid-s18581" xml:space="preserve">Ad hos verò efformandos terreni halitus videntur inepti; </s>
            <s xml:id="echoid-s18582" xml:space="preserve">
              <lb/>
            quippe quos ſuâ quantavis levitate ad tantam altitudinem in
              <lb/>
            cœleſtem uſque regionem aſſurgere credibile non eſt, & </s>
            <s xml:id="echoid-s18583" xml:space="preserve">præte-
              <lb/>
            rea tantæ moli quomodo materiam ſufficere ex ſuis expira-
              <lb/>
            tionibus terra valeat, non facilè intelligo: </s>
            <s xml:id="echoid-s18584" xml:space="preserve">ſiquidem Cometæ
              <lb/>
            anni 1472. </s>
            <s xml:id="echoid-s18585" xml:space="preserve">diametrum æſtimavit Jo: </s>
            <s xml:id="echoid-s18586" xml:space="preserve">Regiomontanus millia-
              <lb/>
            rium Italicorum 64. </s>
            <s xml:id="echoid-s18587" xml:space="preserve">quanta igitur globi totius ſoliditas? </s>
            <s xml:id="echoid-s18588" xml:space="preserve">Cometę
              <lb/>
            anni 1577. </s>
            <s xml:id="echoid-s18589" xml:space="preserve">cujus caput à terræ centro diſtare ſemidiametros ter-
              <lb/>
            reſtres 210. </s>
            <s xml:id="echoid-s18590" xml:space="preserve">cenſuit Tycho, ex apparente diametro minutorum 7. </s>
            <s xml:id="echoid-s18591" xml:space="preserve">
              <lb/>
            ſoliditatem comparatam cum terræ ſoliditate collegit eſſe ut
              <lb/>
            1. </s>
            <s xml:id="echoid-s18592" xml:space="preserve">ad 101{2/3}. </s>
            <s xml:id="echoid-s18593" xml:space="preserve">ad Lunę verò ſoliditatem ut 1. </s>
            <s xml:id="echoid-s18594" xml:space="preserve">ad 2{1/3}. </s>
            <s xml:id="echoid-s18595" xml:space="preserve">Sed V Ville-
              <lb/>
            brordus Snellius, qui eum altiùs evehebat, videlicet ad ſemi-
              <lb/>
            diam. </s>
            <s xml:id="echoid-s18596" xml:space="preserve">terr. </s>
            <s xml:id="echoid-s18597" xml:space="preserve">300. </s>
            <s xml:id="echoid-s18598" xml:space="preserve">ſub eadem diametro apparente, ſoliditatem
              <lb/>
            arguebat ad ſoliditatem terræ ut 8. </s>
            <s xml:id="echoid-s18599" xml:space="preserve">ad 27. </s>
            <s xml:id="echoid-s18600" xml:space="preserve">Celeberrimi Cometæ
              <lb/>
            anni 1618. </s>
            <s xml:id="echoid-s18601" xml:space="preserve">Caput ad terræ globum ut 1. </s>
            <s xml:id="echoid-s18602" xml:space="preserve">ad 870.</s>
            <s xml:id="echoid-s18603" xml:space="preserve">, ad Lunæ autem
              <lb/>
            globum ut 1. </s>
            <s xml:id="echoid-s18604" xml:space="preserve">ad 20. </s>
            <s xml:id="echoid-s18605" xml:space="preserve">æſtimavit Longomontanus die 27. </s>
            <s xml:id="echoid-s18606" xml:space="preserve">Decembris
              <lb/>
            ſub diametro apparenti min. </s>
            <s xml:id="echoid-s18607" xml:space="preserve">3. </s>
            <s xml:id="echoid-s18608" xml:space="preserve">& </s>
            <s xml:id="echoid-s18609" xml:space="preserve">diſtantiâ ſemid. </s>
            <s xml:id="echoid-s18610" xml:space="preserve">terr. </s>
            <s xml:id="echoid-s18611" xml:space="preserve">240. </s>
            <s xml:id="echoid-s18612" xml:space="preserve">At
              <lb/>
            Cyſatus die 9. </s>
            <s xml:id="echoid-s18613" xml:space="preserve">Decembris ſub apparenti diametro min. </s>
            <s xml:id="echoid-s18614" xml:space="preserve">7. </s>
            <s xml:id="echoid-s18615" xml:space="preserve">& </s>
            <s xml:id="echoid-s18616" xml:space="preserve">
              <lb/>
            diſtantiâ ſemid. </s>
            <s xml:id="echoid-s18617" xml:space="preserve">terr. </s>
            <s xml:id="echoid-s18618" xml:space="preserve">100. </s>
            <s xml:id="echoid-s18619" xml:space="preserve">æſtimavit ad terræ globum eſſe ut 1. </s>
            <s xml:id="echoid-s18620" xml:space="preserve">
              <lb/>
            ad 950. </s>
            <s xml:id="echoid-s18621" xml:space="preserve">ad Lunæ verò globum ut 1. </s>
            <s xml:id="echoid-s18622" xml:space="preserve">ad 22. </s>
            <s xml:id="echoid-s18623" xml:space="preserve">Tantum igitur ma-
              <lb/>
            teriæ à tellure ſubminiſtrari, licèt illa dicatur maximam rari-
              <lb/>
            tatem aſſumpſiſſe, non ſinè difficultate concederem. </s>
            <s xml:id="echoid-s18624" xml:space="preserve">Quod ſi
              <lb/>
            vel ſuſpicionem movere audeam, ex Cœleſtibus corporibus
              <lb/>
            Cometarum materiam fuiſſe deſumptam, illico clamabunt
              <lb/>
            lycæa, quaſi diſſolvendum eſſet cœlum, & </s>
            <s xml:id="echoid-s18625" xml:space="preserve">extinguendi æterni
              <lb/>
            illi ignes.</s>
            <s xml:id="echoid-s18626" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s18627" xml:space="preserve">Grad. </s>
            <s xml:id="echoid-s18628" xml:space="preserve">Me verò ancipitem ſemper tenuit etiam Cometarum
              <lb/>
            motus; </s>
            <s xml:id="echoid-s18629" xml:space="preserve">non ille quidem, qui ſingulorum proprius dicitur, ſed
              <lb/>
            diurnus, univerſo Cœlo communis, & </s>
            <s xml:id="echoid-s18630" xml:space="preserve">quem vocant Primi Mo-
              <lb/>
            bilis. </s>
            <s xml:id="echoid-s18631" xml:space="preserve">Quod enim ad motum proprium attinet, qui communi-
              <lb/>
            ter obſervatus eſt ſecundùm ſeriem ſignorum ab Occaſu in,
              <lb/>
            Ortum (quamvis aliquando ſub initium, aliquando circa finem
              <lb/>
            contigerit illum in præcedentia Signa remeare) ſatis videba-
              <lb/>
            tur, ſi Cometa in plagâ Occidentali accenſus recto tramite,
              <lb/>
            aſcenderet, aut contrà in plagâ Cœli Orientali deſcenderet, ut
              <lb/>
            cum ſtellís fixis comparatus ſpeciem haberet accedentis ad </s>
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