Galilei, Galileo, The systems of the world, 1661

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1would never with his walking have arrived, if the Ship with its
motion had not wafted him thither.
A ſingle
able hath but onely
one natural
on, and all the
reſt are by
pation.
SAGR. Tell me ſecondly. That motion, which is
cated to any moveable by participation, whileſt it moveth by it
ſelf, with another motion different from the participated, is it
neceſſary, that it do reſide in ſome certain ſubject by it ſelf, or
elſe can it ſubſiſt in nature alone, without other ſupport.
SIMPL. Ariſtotle giveth you an anſwer to all theſe queſtions,

and tels you, that as of one ſole moveable the motion is but one;
ſo of one ſole motion the moveable is but one; and
ly, that without the inherence in its ſubject, no motion can
ther ſubſiſt, or be imagined.
Motion cannot
be made without
its moveable
ject.
SAGR. I would have you tell me in the third place, whether
you beblieve that the Moon and the other Planets and Cœleſtial
bodies, have their proper motions, and what they are.
SIMPL. They have ſo, and they be thoſe according to which
they run through the Zodiack, the Moon in a Moneth, the Sun
in a Year, Mars in two, the Starry Sphere in thoſe ſo many
ſand.
And theſe are their proper, or natural motions.
SAGR. But that motion wherewith I ſee the fixed Stars, and
with them all the Planets go unitedly from Eaſt to Weſt, and
turn round to the Eaſt again in twenty four hours, how doth it
agree with them?
SIMPL. It ſuiteth with them by participation.
SAGR. This then reſides not in them, and not reſiding in
them, nor being able to ſubſiſt without ſome ſubject in which it
is reſident, it muſt of force be the proper and natural motion of
ſome other Sphere.
SIMPL. For this purpoſe Aſtronomers, and Philoſophers have
found another high Sphere, above all the reſt, without Stars, to
which Natural agreeth the Diurnal Motion; and this they call
the Primum mobile; the which carrieth along with it all the
feriour Spheres, contributing and imparting its motion to
them.
SAGR. But when, without introducing other Spheres unknown
and hugely vaſt, without other motions or communicated raptures,
with leaving to each Sphere its ſole and ſimple motion, without
intermixing contrary motions, but making all turn one way, as
it is neceſſary that they do, depending all upon one ſole principle,
all things proceed orderly, and correſpond with moſt perfect
mony, why do we reject this Phœnomenon, and give our aſſent to
thoſe prodigious and laborious conditions?
SIMPL. The difficulty lyeth in finding out this ſo natural and
expeditious way.

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