Gassendi, Pierre, De motu impresso a motore translato epistulae duae, 1642

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1trogradatione, & directione Planetarum, quidpiam
colligatur
ad ſtabiliendum Terræ quietem, vt po­
tiùs
non ſit argumentum magis conſentaneum, quo
motus
illi aſſeratur.
Quæſo te enim quidnam poſſit
eſſe
probabilius, quàm magna iſta corpora, globos, in­
quam
, Planetarum, vno tenore incedere, & ſuam ſem­
per
viam, ſeu prorſùm, antrorſumve ire?
Ibunt porrô,
ſi
Terra quidem inter ipſos media incedat, ac di­
recta
eſſe nunquam deſinat: & quòd interdum ſta­
tionarij
, retrogradique appareant, continget appa­
ritio
ex commiſtione motus ipſius.
Explicant hæc vul­
per Epicyclos, quorum centra circa Terram vno
tenore
ſic ferantur; vt Planetæ interìm in ſuperfi­
ciebus
Epicyclorum moti, ad ſuperiores quidem
parteis
directi ſint, ad inferiores retrogradi, & in
medio
deſcenſu, aſcenſuque, ſtationarij.
At quan­
tum
quæſo compendium, vt vnica Terra vnico inceſ­
ſu
Epicyclos omneis faciat ſuperuacaneos, Planetas
illis
eximat, alteróque motu abſoluat?
Et de duobus
quidem
Soli proximis, Mercurio, nempe, ac Venere,
vt
primùm dicam; Quid eſt, cur Epicyclos fingant,
quorum
centra contineantur inuariabiliter in linea à
Terra
in Solem directa?
Cur Planetarum remotio­
rum
epicycli liberi ſunt; epicycli iſtorum duorum ad
Solem
ita illigati?
Cur ſaltem non eſt alter duorum
liber
?
Cur neuter horum Planetarum ad ſextilem
vſque
aſpectum heinc inde à Sole diſcedit, ſed cùm
vix
ſigno, aut ſeſqui-ſigno ſepoſitus eſt, ipſum repetit,
ſeu
retrogradus ab ortu, ſeu directus ab occaſu?
Cur
non
proinde inſtar aliorum motibus ſuis nos circum-

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