Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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appatentem nobis ejuſdem motus inæqualitatem; licet enim motus à C
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in G; & à G in revera æqualis ſint, inæquales tamen nobis appa
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rent ; nempe dum terra decurrit arcum CG, quadratum ſcilicet ſui
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Orbis, videtur nobis decurriſſo arcum CN minorem quadrante; & dum
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decurrit GE æqualem CH, videtur nobis decurrere arcum NF majo
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rem, perinde quippe eſt, ſive terram in G aſpicias ex A, ſive ex G Solem
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in A ſpectes; vt ſcilicet illum videas in puncto Eclypticæ, oppoſito,
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puncto G. </
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Chryſocom.
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<
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"> Sed vndo Apogæi motus, iſque in conſequentia. </
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Antim.
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</
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<
s
id
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"> Fac terram ex C, peracto ſemicirculo nondum ad Perigæum
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perveniſſe, nec peracto orbe integro ad Apogæum ; inde neceſſariò ſe
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quitur, Apogæum promoveri in conſequentia, ſcilicet à G versùs H ; in
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antecedentia autem moveretur, ſi terra ad Apogæum reditet nondum
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peracto orbe integro. </
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Chryſocom.
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</
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<
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id
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"> Omitte, quæſo hæc enim faciliora ſunt, quàm vt longio
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rem explicationem poſtulent; ſed vnde quæſo orbis annuus centri; vnde
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diurnus orbis, itemque annuus illi oppoſitus? </
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Antim.
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</
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<
s
id
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"> Neque in hoc multùm laboro; ſi enim ſupponas terræ globum
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ita demiſſum fuiſſe ex ſublimi, ad acquiren dum illum velocitatis gradum,
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qui neceſſarius ſit, vt vna pars globi fortè præponderans, ante aliàs de
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ſcenderit, vnde motus quidam mixtus ſequatur, ex motu orbis & cen
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tri; ſi hoc ſupponas, inquam, vbi dictus globus ad diſtantiam mediam
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pervenit, illico motu circulari moveri cœpit in eam partem, in quam
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motus Orbis prævius illum determinat; analogiam habes in globo vel
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diſco, qui deorſum præfato modo dimiſſus deſcendit; vbi enim planum
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horizontale attingit, in eo movetur, ſeu rotatur, priore determinatione
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durante. </
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<
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">v. g. ſit globus BCDE, (
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in Figura
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) centro A ita demiſſus
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per lineam perpendicularem AH, vt centrum quidem A rectam deſcri
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bat; aliæ verò partes etiam moveantur circa A, v.g. B in C, D, E, vbi
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globus attinget planum horizontale KL, in H, vi prioris determina
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tionis, ſeu motus Orbis, F tendet in GH, I, vnde rotabitur globus in
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dicto plano versùs K. </
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<
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id
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">Idem dicendum de globo terræ tali modo de
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miſſo, cujus centrum movetur motu æquabili in Plano Eclipticæ cum
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eo velocitatis gradu, quem in primo illo deſcenſu acquiſivit, qui
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deinde ſemper intactus manet; pari modo motus Orbis etiam durat,
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cùm eadem ſit pro vtroque motu ratio, vt videre eſt in prædicto
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globo. </
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Choyſoc.
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<
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id
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"> Sed cur circa talem axem potiùs quàm circa alium? </
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<
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id
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">deinde
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cur libratur prædictus axis? </
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<
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id
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">denique cur omnes circuli diurni Æquatori
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ſunt paralleli? </
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Antim.
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<
s
id
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s.000990
"> Niſi orationem meam interrupiſſes, hæc continuò æquè facilè
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explicabam; Suppono terræ globum vel magnum Magnetem eſſe, vel ſal
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tem magnetica virtute inſtructum, vnde neceſſe ſit, duos polos magneticos
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ineſſe, & axem ad vtremque polum terminatum, quem etiam ſibi ipſi ſem-</
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