Biancani, Giuseppe
,
Aristotelis loca mathematica
,
1615
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198
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009/01/198.jpg
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<
s
id
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s.003329
">Secunda verò ratio, quæ maximè eos torquet eſt quanam ratione à Luna
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lb
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effici poſſit ſecundus refluxus B, primò oppoſitus, cum tota terræ moles in
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teriecta obſtare videatur.</
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</
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<
s
id
="
s.003330
">Verum huic difficultati optimè ex opticis ſatisfacere poſſumus, fi dixe
<
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rimus, æſtum illum effici quidem à Luna, & Sole, ſed tamen per lumen ex
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ſyderibus ad partem illam auerſam reflexum; quod vt melius explicetur, &
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confirmetur. </
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>
<
s
id
="
s.003331
">Illud primò ſciendum non ſolam Lunam, verum etiam Solem
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ad æſtum maris ciendum concurrere, quamuis primas in hoc Lunæ conce
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dat; experientia enim conſtat maiorem fieri fluxum, quando Sol, & Luna
<
lb
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ſimul ſunt coniuncta, vt in nouilunio accidit, quia lumina, & eorum virtu
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tes vnitæ fortius eandem maris partem directis radijs percellunt. </
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>
<
s
id
="
s.003332
">ſimiliter
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maior fit, quando luminaria ſunt oppoſita, vt in plenilunio contingit, quia
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tunc radij vnius directi, aſſociantur cum reflexis alterius radijs,
<
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abbr
="
hocq́
">hocque</
expan
>
; mo
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do duplicati eaſdem terræ partes, & directè, & reflexè feriunt, vt melius in
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ſequenti figura patebit.</
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>
</
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<
s
id
="
s.003333
">Secundò præmittendum eſt, lumen Solis, & Lunæ reflecti ex denſis, ac per
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politis corporibus, vti ſunt omnia ſydera.</
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</
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<
s
id
="
s.003334
">Tertiò, ex opticis aſſumendum, ſi corpora plurima ſphærica lumen re
<
lb
/>
flectentia fuerint in circulari ambitu conſtituta, quemadmodum ſunt ſtellæ
<
lb
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affixæ in ambitu firmamenti collocatæ, reflectere
<
expan
abbr
="
plurimũ
">plurimum</
expan
>
lumen ad vnum,
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lb
/>
& idem punctum, quod ſit inter lumen, & ambitum illum; quod aſſumptum
<
lb
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manifeſtum eſt ex Iride, vbi ex plurimis ſphæricis guttulis lumen Solis re
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flectitur ad oculum; quamuis geometricè, & quidem facilè à Perſpectiuo
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demonſtrari poſſit.</
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type
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<
s
id
="
s.003335
">Quartò, ex opticis, dato corpore luminoſo, & ſphærico reflectente, &
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puncto quouis, ad quod poſſit reflecti lumen, poteſt inueniri in ſphæra refle
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ctente punctum reflexionis.</
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type
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<
s
id
="
s.003336
">Quintò, quanto radij perpendiculariores incidunt, tanto maiorem
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vim habere.</
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>
</
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<
p
type
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main
">
<
s
id
="
s.003337
">Sit ergò Sol, & Luna ſimul, vt in figura
<
expan
abbr
="
ſitq́
">ſitque</
expan
>
; octauæ ſphæræ portio A B C,
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cum innumeris in ea affixis ſyderibus. </
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>
<
s
id
="
s.003338
">eſſe autem totum cœlum ſtellis penè
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infinitis, ac conſtipatis refertum ſenſui palam fit, adhibito nouo illo, ac mi
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rabili Teleſcopij inuento.</
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<
s
id
="
s.003339
">Iam, vt patet ex 39.5. Alhazeni, ex ſingulis ſtellis Solis, ac Lunæ lumen
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reflecti poteſt (niſi quid obſtet) ad partem terræ D, luminaribus auerſam,
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vt quarto loco ſuppoſui. </
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>
<
s
id
="
s.003340
">& præterea ex ſtellis circa B, poſitis radij Solis re
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percuti poſſunt ad eandem terræ partem D, perpendiculares, qui præ cæte
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ris maximam vim obtinent. </
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>
<
s
id
="
s.003341
">quemadmodum lineæ in figura reflexæ
<
expan
abbr
="
vtcunq;
">vtcunque</
expan
>
<
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/>
oſtendunt, ideò aſſerendum eſt eos, æſtum D, excitare præcipuè poſſe,
<
expan
abbr
="
neq;
">neque</
expan
>
<
lb
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terræ quantitas Solis luci obeſt, cum conſtet vmbram terræ parum ſupra
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Lunæ cœlum produci. </
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>
<
s
id
="
s.003342
">poteſt tamen Lunæ eſſe impedimento quoad hos ra
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dios perpendiculares; ſed tamen alios minus perpendiculares, ſeu parum
<
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obliquos nullo modo impedire poteſt, quo minus ad D, reſiliant. </
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>
<
s
id
="
s.003343
">qui quam
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uis ſint minus quàm perpendiculares efficaces, obtinent tamen non modi
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cam vim. </
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>
<
s
id
="
s.003344
">Ex ſtellis igitur circa A, & C, reflecti poteſt ex quarto fundamen
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to lumen
<
expan
abbr
="
vtriuſq;
">vtriuſque</
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>
luminaris ad D, quod ſatis eſt efficax, cùm ferè </
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