Casati, Paolo
,
De igne dissertationes physicae
,
1686
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Diſſertatio Quinta.
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ardentis, tum obiecti Solis lumen recipiunt, quod ad nos refle-
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ctunt, augent apparentem Cometę magnitudinem limbum
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conſtituentes, & </
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<
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xml:space
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aliquando uniunt, aliquando diſpergunt, variamque tribuunt
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ipſi caudæ figuram, ratione tum longitudinis tum latitudinis.
<
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</
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<
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xml:space
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">Quoniam verò contingere poteſt, ut halitûs illi refractorii ſe-
<
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cundùm diverſas ſuperficies Solis radium aut directè aut obli-
<
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què recipientes ita ſint poſiti, ut alii lucem rectâ dirigant, alii
<
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illam aliorſum inflectant, etiam cauda ſinuata apparebit, atque
<
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ſive ſurſum, ſive deorſum curvata. </
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<
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xml:space
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">Ex his demum halituum
<
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compactorum faciebus diverſis cauſa redditur, cur aliquando
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cauda brevior ex improviſo ſtatim longior appareat etiam
<
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cum vibratione; </
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<
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xml:space
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">quia nimirum halitûs illi commoti & </
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<
s
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xml:space
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">agitati
<
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diverſas facies Soli obvertunt, exceptoſque radios longiùs pro-
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jiciunt, ſuòque motu vibrationem efficiunt.</
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<
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xml:space
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</
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<
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<
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xml:space
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">Grad. </
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<
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xml:space
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">Nimis operoſum eſſet ſingula Cometarum, qui ali-
<
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quando viſi ſunt, phænomena conari explicare, prout ab Hi-
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ſtoricis tradita ſunt; </
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<
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xml:space
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">multa quippe ex vulgi rumoribus ſępè
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acceperunt, necipſi teſtes ac ſpectatores fuere: </
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<
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xml:space
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">ideò plenę voca-
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bulorum notioni aliquid non rarò demendum cenſeo. </
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<
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xml:space
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">Sic apud
<
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Juſtinum lib. </
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<
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">37. </
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>
<
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xml:space
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">de Mithridate ſcribentem legimus. </
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>
<
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xml:space
="
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">Hujus igi-
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tur futuram amplitudinem etiam cœleſtia oſtenta prædixerant. </
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>
<
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xml:id
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xml:space
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">Nam
<
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& </
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>
<
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xml:space
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">quo genitus eſt anno, & </
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>
<
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xml:id
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xml:space
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">quo regnare primùm cœpit, ſtella Cometes
<
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per utrumque tempus ſeptuaginta diebus it a luxit, ut Cœlum omne
<
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conflagrare videretur. </
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>
<
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xml:id
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xml:space
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">Nam & </
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>
<
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xml:space
="
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">magnitudine quartam partem cœli
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occupaverat, & </
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>
<
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xml:space
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">fulgore nitorem Solis vicerat, & </
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>
<
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xml:space
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">cum oriretur, occi-
<
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deretque, quatuor ſpatium borarum conſumebat. </
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>
<
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xml:id
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xml:space
="
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">Quę verba niſi
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benignâ interpretatione mitigentur, hyperbolem ſapiunt: </
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<
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xml:space
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">quis
<
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enim credat fulgore ſuo Cometam viciſſe nitorem ſolis, quaſi
<
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Sole lucidior fuerit? </
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>
<
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xml:space
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">ſed leniri poteſt ſignificatio verborum, ſi
<
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/>
interpretemur eam fuiſſe Cometæ lucem, ut à diurno Solis
<
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ſplendore non obtunderetur, quin conſpicua eſſet. </
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>
<
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xml:space
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">Etenim
<
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Seneca lib. </
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">7. </
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<
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xml:space
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">20. </
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>
<
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xml:space
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">ait, Multos Comet as non videmus, quòd obſcu-
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rantur radiis Solis; </
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<
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xml:space
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">quo deficiente quendam Cometem apparuiſſe,
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quem Sol vicinus obtexerat, Poſſidonius tradit. </
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>
<
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xml:space
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">Quòd verò Cœlum
<
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/>
omne conflagrare videretur, utique dictum per vulgarem au-
<
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/>
xeſim, ad ſignificandam ingentem flammam, quam imitabatur
<
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/>
cauda ad gradûs 45. </
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>
<
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xml:space
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">exporrecta, adeò ut tanta longitudo ex
<
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horizonte obliquè aſcendens, & </
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<
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xml:space
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">infrà illum obliquè deſcen-
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dens quatuor horarum ſpatium abſumeret.</
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