Casati, Paolo
,
De igne dissertationes physicae
,
1686
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421 - 430
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Diſſertatio Quinta.
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thematicos) judicium ferre de illorum argumentationibus, an
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planè Geometricam ſubtilitatem aſſequantur, ad apodicticas
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tamen ratiocinationes tam propè accedunt, ut longè probabi-
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lius ſit Cometas aliquos ultra lunaris Cœli terminos fulſiſſe.
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</
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<
s
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xml:space
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">Ad hos verò efformandos terreni halitus videntur inepti; </
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<
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quippe quos ſuâ quantavis levitate ad tantam altitudinem in
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cœleſtem uſque regionem aſſurgere credibile non eſt, & </
s
>
<
s
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xml:space
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rea tantæ moli quomodo materiam ſufficere ex ſuis expira-
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tionibus terra valeat, non facilè intelligo: </
s
>
<
s
xml:id
="
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xml:space
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">ſiquidem Cometæ
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anni 1472. </
s
>
<
s
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xml:space
="
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">diametrum æſtimavit Jo: </
s
>
<
s
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xml:space
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">Regiomontanus millia-
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rium Italicorum 64. </
s
>
<
s
xml:id
="
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"
xml:space
="
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">quanta igitur globi totius ſoliditas? </
s
>
<
s
xml:id
="
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"
xml:space
="
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">Cometę
<
lb
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anni 1577. </
s
>
<
s
xml:id
="
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"
xml:space
="
preserve
">cujus caput à terræ centro diſtare ſemidiametros ter-
<
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reſtres 210. </
s
>
<
s
xml:id
="
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xml:space
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">cenſuit Tycho, ex apparente diametro minutorum 7. </
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>
<
s
xml:id
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ſoliditatem comparatam cum terræ ſoliditate collegit eſſe ut
<
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1. </
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<
s
xml:id
="
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xml:space
="
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">ad 101{2/3}. </
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<
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xml:id
="
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xml:space
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">ad Lunę verò ſoliditatem ut 1. </
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>
<
s
xml:id
="
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"
xml:space
="
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">ad 2{1/3}. </
s
>
<
s
xml:id
="
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"
xml:space
="
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">Sed V Ville-
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brordus Snellius, qui eum altiùs evehebat, videlicet ad ſemi-
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diam. </
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>
<
s
xml:id
="
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xml:space
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">terr. </
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>
<
s
xml:id
="
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"
xml:space
="
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">300. </
s
>
<
s
xml:id
="
echoid-s18598
"
xml:space
="
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">ſub eadem diametro apparente, ſoliditatem
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arguebat ad ſoliditatem terræ ut 8. </
s
>
<
s
xml:id
="
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"
xml:space
="
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">ad 27. </
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>
<
s
xml:id
="
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xml:space
="
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">Celeberrimi Cometæ
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anni 1618. </
s
>
<
s
xml:id
="
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xml:space
="
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">Caput ad terræ globum ut 1. </
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>
<
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xml:id
="
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xml:space
="
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">ad 870.</
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>
<
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xml:space
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">, ad Lunæ autem
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globum ut 1. </
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>
<
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xml:id
="
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xml:space
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">ad 20. </
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<
s
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xml:space
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">æſtimavit Longomontanus die 27. </
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<
s
xml:id
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xml:space
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">Decembris
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ſub diametro apparenti min. </
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<
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xml:id
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xml:space
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">3. </
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<
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xml:id
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xml:space
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">& </
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<
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xml:id
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xml:space
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">diſtantiâ ſemid. </
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>
<
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xml:id
="
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"
xml:space
="
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">terr. </
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<
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="
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xml:space
="
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">240. </
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>
<
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xml:id
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xml:space
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">At
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Cyſatus die 9. </
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>
<
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xml:id
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xml:space
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">Decembris ſub apparenti diametro min. </
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<
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xml:id
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xml:space
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">7. </
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>
<
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xml:space
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">& </
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<
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xml:id
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xml:space
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<
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diſtantiâ ſemid. </
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>
<
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xml:space
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">terr. </
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<
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xml:id
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xml:space
="
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">100. </
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<
s
xml:id
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xml:space
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">æſtimavit ad terræ globum eſſe ut 1. </
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<
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ad 950. </
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xml:space
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">ad Lunæ verò globum ut 1. </
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>
<
s
xml:id
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xml:space
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">ad 22. </
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<
s
xml:id
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xml:space
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">Tantum igitur ma-
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teriæ à tellure ſubminiſtrari, licèt illa dicatur maximam rari-
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tatem aſſumpſiſſe, non ſinè difficultate concederem. </
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>
<
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xml:space
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">Quod ſi
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vel ſuſpicionem movere audeam, ex Cœleſtibus corporibus
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Cometarum materiam fuiſſe deſumptam, illico clamabunt
<
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lycæa, quaſi diſſolvendum eſſet cœlum, & </
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>
<
s
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xml:space
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">extinguendi æterni
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illi ignes.</
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</
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<
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">Grad. </
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<
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">Me verò ancipitem ſemper tenuit etiam Cometarum
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motus; </
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<
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xml:space
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">non ille quidem, qui ſingulorum proprius dicitur, ſed
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diurnus, univerſo Cœlo communis, & </
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<
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xml:space
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">quem vocant Primi Mo-
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bilis. </
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<
s
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xml:space
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">Quod enim ad motum proprium attinet, qui communi-
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ter obſervatus eſt ſecundùm ſeriem ſignorum ab Occaſu in,
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Ortum (quamvis aliquando ſub initium, aliquando circa finem
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contigerit illum in præcedentia Signa remeare) ſatis videba-
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tur, ſi Cometa in plagâ Occidentali accenſus recto tramite,
<
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aſcenderet, aut contrà in plagâ Cœli Orientali deſcenderet, ut
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cum ſtellís fixis comparatus ſpeciem haberet accedentis ad </
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