Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667
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1tion given us by Salviatus; yet do I not find that my Logick,

whilſt I have a regard to form, teacheth me, that that kind of
gumentation affords me any neceſſary reaſon to conclude in
vour of the Copernican Hypotheſis, that is, of the ſtability of
the Sun in the centre of the Zodiack, and of the mobility of
the Earth under its circumference.
For although it be true, that
the ſaid converſion of the Sun, and cirnition of the Earth being
granted, there be a neceſſity of diſcerning ſuch and ſuch ſtrange
extravagancies as theſe in the ſpots of the Sun, yet doth it not
follow that arguing per converſum, from finding ſuch like
uſual accidents in the Sun, one muſt of necſſity conclude the
Earth to move by the circumference, and the Sun to be placed
in the centre of the Zodiack.
For who ſhall aſſertain me that the
like irregularities may not as well be viſible in the Sun, it being
moveable by the Ecliptick, to the inhabitants of the Earth, it
being alſo immoveable in the centre of the ſame?
Unleſſe you
demonſtrate to me, that there can be no reaſon given for that
pearance, when the Sun is made moveable, and the Earth ſtable,
I will not alter my opinion and belief that the Sun moveth, and
the Earth ſtandeth ſtill.
Though the
nual motion
ed to the Earth
ſwerth to the
nomena of the
lar ſpots, yet doth
it not follow by
verſion that from
the Phænomena of
the ſpots one may
infor the annual
motion to belong to
the Earth.
SAGR. Simplicius behaveth himſelf very bravely, and argueth
very ſubtilly in defence of the cauſe of Ariſtotle and Ptolomy;
and if I may ſpeak the truth, mythinks that the converſation of
Salviatus, though it have been but of ſmall continuance, hath
much farthered him in diſcourſing ſilogiſtically.
An effect which
I know to be wrought in others as well as him.
But as to finding
and judging whether competent reaſon may be rendered of the
apparent exorbitancies and irregularities in the motions of the
ſpots, ſuppoſing the Earth to be immoveable, and the Sun
moveable, I ſhall expect that Salviatus manifeſt his opinion to
us, for it is very probable that he he hath conſidered of the
ſame, and collected together whatever may be ſaid upon the
point.
SALV. I have often thought thereon, and alſo diſcourſed
thereof with my Friend and Gueſt afore-named; and touching
what is to be produced by Philoſophers and Aſtronomers, in
fence of the ancient Syſteme, we are on one hand certain,
tain I ſay, that the true and pure Peripateticks laughing at ſuch

as employ themſelves in ſuch, to their thinking, inſipid
ries, will cenſure all theſe Phænomena to be vain illuſions of the
Chriſtals; and in this manner will with little trouble free
ſelves from the obligation of ſtudying any more upon the ſame.
Again, as to the Aſtronomical Philoſophers, after we have with
ſome diligence weighed that which may be alledged as a mean
between thoſe two others, we have not been able to find out an

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