Foscarini, Paolo Antonio, An epistle to fantoni, 1661

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* 2 Pet. 1. 19.
But yet becauſe the common Syſteme of the World deviſed by
Ptolomy hath hitherto ſatisfied none of the Learned, hereupon a
ſuſpicion is riſen up amongſt all, even Ptolemy's followers them-
ſelves, that there muſt be ſome other Syſteme, which is more true
than this of Ptolemy; For although the Phœnomena of Celeſtial
Bodys may ſeem to be generally reſolved by this Hypotheſis, yet
they are found to be involved with many difficulties, and refer-
red to many devices; as namely of Orbes of ſundry Forms and
Figures, Epicicles, Equations, Differences, Excentricks, andinnu-
merable ſuch like fancies and Chymæra's which ſavour of the
Ens Rationis of Logicians, rather than of any Realem Eſſentiam.
Of which kinde is that of the Rapid Motion, than which I finde
not any thing that can be more weakly grounded, and more eaſi-
ly controverted and diſproved: And ſuch is that conceit of the
^{*} Heaven void of Stars, moving the inferior Heavens or Orbes:

All which are introduced upon occaſion of the variety of the
Motions of Celeſtial Bodyes, which ſeemed impoſſible, by any
other way, to be reduced to any certain and determinate Rule.
So that the Aſſertors of that common Opinion, freely confeſs,
that in deſcribing the Worlds Syſteme, they cannot as yet diſco-
ver, or teach the true Hypotheſis thereof: But that their endea-
vours are onely to finde out, amongſt many things, what is moſt
agreeable with truth, and may, upon better and more accomo-
date Reaſons, anſwer the Celeſtial Phœnomena.
* Or Primum
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