Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667

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1greateſt Senſations, as for inſtance it would be, if we that feel the

reſpirations of a gentle gale, ſhould not feel the impulſe of a
petual winde that beateth upon us with a velocity that runs more
than 2529 miles an hour, for ſo much is the ſpace that the centre
of the Earth in its annual motion paſſeth in an hour upon the
cumference of the grand Orb, as he diligently calculates; and
becauſe, as he ſaith, by the judgment of Copernicus, Cum terra
movetur circumpoſitus aër, motus tamen ejus, velocior licet ac
pidior celerrimo quocunque vento, à nohis non ſentiretur, ſed
ma tum tranquilitas reputaretur, niſi alius motus accederet.
Quid
eſt verò decipi ſenſum, niſi hæc eſſet deceptio? [Which I make to
ſpeak to this ſenſe.] The circumpoſed air is moved with the Earth,
yet its motion, although more ſpeedy and rapid than the ſwifteſt
wind whatſoever, would not be perceived by us, but then would
be thought a great tranquillity, unleſſe ſome other motion ſhould
happen; what then is the deception of the ſenſe, if this be
not?
The annual
tion of the Earth
muſt cauſe a
petual and ſtrong
winde.
SALV. It muſt needs be that this Philoſopher thinketh, that
that Earth which Copernicus maketh to turn round, together with
the ambient air along the circumference of the great Orb, is not that
whereon we inhabit, but ſome other ſeparated from this; for that this
of ours carrieth us alſo along with it with the ſame velocity, as

ſo the circumjacent air: And what beating of the air can we feel,
when we fly with equal ſpeed from that which ſhould accoſt us?
This Gentleman forgot, that we no leſs than the Earth and air are
carried about, and that conſequently we are always touch'd by
one and the ſame part of the air, which yet doth not make us feel
it.
The air alwayes
touching us with
the ſame part of it
cannot make us
feel it.
SIMP. But I rather think that he did not ſo think; hear the
words which immediately follow. Præterea nos quoque rotamur
ex circumductione terræ &c.
SALV. Now I can no longer help nor excuſe him; do you
plead for him and bring him off, Simplicius.
SIMP. I cannot thus upon the ſudden think of an excuſe that
pleaſeth me.
SALV. Go to; take this whole night to think on it, and
fend him to morrow; in the mean time let us hear ſome other of
his objections.
SIMP. He proſecuteth the ſame Objection, ſhewing, that in the

way of Copernicus, a man muſt deny his own ſenſes. For that
this principle whereby we turn round with the Earth, either is
intrinſick to us, or external; that is, a rapture of that Earth; and
if it be this ſecond, we not feeling any ſuch rapture, it muſt be
confeſſed that the ſenſe of feeling, doth not feel its own object
touching it, nor its impreſſion on the ſenſible part: but if the

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