Galilei, Galileo, The systems of the world, 1661

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The Sun more
bably
in the centre
of
the Vniverſe,
than
the Earth.
SIMPL. Certainly, if you in this manner deny not onely the
Principles
of Sciences, but manifeſt Experience, and the Senſes
themſelves
, you can never be convinced or removed from any
pinion
which you once conceit, therefore I will chooſe rather to
be
ſilent (for, contra negantes principia non eſt diſputandum)
than
contend with you.
And inſiſting on the things alledged by
you
even now (ſince you queſtion ſo much as whether grave
ables
have a right motion or no) how can you ever rationally

ny
, that the parts of the Earth; or, if you will, that ponderous
matters
deſcend towards the Centre, with a right motion;
as
, if from a very high Tower, whoſe walls are vcry upright and
perpendicular
, you let them fall, they ſhall deſcend gliding and
ſliding
by the Tower to the Earth, exactly in that very place
where
a plummet would fall, being hanged by a line faſtned above,
juſt
there, whence the ſaid weights were let fall?
is not this a
more
than evident argument of the motions being right, and

wards
the Centre?
In the ſecond place you call in doubt,
ther
the parts of the Earth are moved, as Ariſtotle affirms,
wards
the Centre of the World; as if he had not rationally
monſtrated
it by contrary motions, whilſt he thus argueth; The
motion
of heavie bodies is contrary to that of the light: but the
motion
of the light is manifeſt to be directly upwards, namely,
towards
the circumference of the World, therefore the motion of
the
heavie is directly towards the Centre of the World: and it

happens
per accidens, that it be towards the centre of the Earth,
for
that this ſtriveth to be united to that.
The ſeeking in the
next
place, what a part of the Globe of the Sun or Moon would
do
, were it ſeparated from its whole, is vanity; becauſe that

by
that is ſought, which would be the conſequence of an
bility
; in regard that, as Ariſtotle alſo demonſtrates, the cœleſtial
bodies
are impaſſible, impenetrable, and infrangible; ſo that ſuch

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