Galilei, Galileo, The systems of the world, 1661

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1uſe, in the ordinate parts of the World; and we did proceed to
ſay
, that it was not ſo in circular motions, of which that which is
made
by the moveable in it ſelf, ſtill retains it in the ſame place,

and
that which carrieth the moveable by the circumference of a
circle
about its fixed centre, neither puts it ſelf, nor thoſe about it
in
diſorder; for that ſuch a motion primarily is finite and terminate
(though not yet finiſhed and determined) but there is no point

in
the circumference, that is not the firſt and laſt term in the
culation
; and continuing it in the circumference aſſigned it, it
leaveth
all the reſt, within and without that, free for the uſe of
others
, without ever impeding or diſordering them.
This being
a
motion that makes the moveable continually leave, and

tinually
arrive at the end; it alone therefore can primarily be
niform
; for that acceleration of motion is made in the moveable,
when
it goeth towards the term, to which it hath inclination;
and
the retardation happens by the repugnance that it hath to
leave
and part from the ſame term; and becauſe in circular
tion
, the moveable continually leaves the natural term, and
tinually
moveth towards the ſame, therefore, in it, the
nance
and inclination are always of equal force: from which
quality
reſults a velocity, neither retarded nor accelerated, i. e. an
uniformity
in motion.
From this conformity, and from the being

terminate
, may follow the perpetual continuation by ſucceſſively
reiterating
the circulations; which in an undeterminated line,
and
in a motion continually retarded or accelerated, cannot

turally
be.
I ſay, naturally; becauſe the right motion which is
retarded
, is the violent, which cannot be perpetual; and the
celerate
arriveth neceſſarily at the term, if one there be; and if
there
be none, it cannot be moved to it, becauſe nature moves
not
whether it is impoſſible to attain.
I conclude therefore, that
the
circular motion can onely naturally conſiſt with natural
dies
, parts of the univerſe, and conſtituted in an excellent
ſure
; and that the right, at the moſt that can be ſaid for it, is

aſſigned
by nature to its bodies, and their parts, at ſuch time as
they
ſhall be out of their proper places, conſtituted in a depraved
diſpoſition
, and for that cauſe needing to be redured by the
eſt
way to their natural ſtate.
Hence, me thinks, it may
nally
be concluded, that for maintenance of perfect order among ſt
the
parts of the World, it is neceſſary to ſay, that moveables are
moveable
onely circularly; and if there be any that move not

circularly
, theſe of neceſſity are immoveable: there being
thing
but reſt and circular motion apt to the conſervation of
der
.
And I do not a little wonder with my ſelf, that Ariſtotle,
who
held that the Terreſtrial globe was placed in the centre of
the
World, and there remained immoveable, ſhould not ſay, that

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