Galilei, Galileo - The systems of the world

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1quence the right or ſtraight motion of ſimple natural bodies, as
being of no uſe in nature, and eſteems the Earth it ſelf alſo to
be one of the Cœleſtial bodies adorn'd with all the prerogatives
that agree with them; which laſt diſcourſe is hitherto much
more likely, in my judgment, than that other. Therefore
ſolve, Simplicius, to produce all the particular reaſons,
ments and obſervations, as well Natural as Aſtronomical, that
may ſerve to perſwade us that the Earth differeth from the
leſtial bodies, is immoveable, and ſituated in the Centre of the
World, and what ever elſe excludes its moving like to the Planets,
as Jupiter or the Moon, &c. And Salviatus will be pleaſed to
be ſo civil as to anſwer to them one by one.

SIMPL. See here for a beginning, two moſt convincing
ments to demonſtrate the Earth to be moſt different from the
Cœleſtial bodies. Firſt, the bodies that are generable,
ptible, alterable, &c. are quite different from thoſe that are
generable, incorruptible, unalterable, &c. But the Earth is
nerable, corruptible, alterable, &c. and the Cœleſtial bodies
generable, incorruptible, unalterable, &c. Therefore the Earth
is quite different from the Cœleſtial bodies.

SAGR. By your firſt Argument you ſpread the Table with the
ſame Viands, which but juſt now with much adoe were voided.

SIMPL. Hold a little, Sir, and take the reſt along with you,
and then tell me if this be not different from what you had
fore. In the former, the Minor was proved à priori, & now you ſee
it proved à poſteriori: Judg then if it be the ſame. I prove the
Minor, therefore (the Major being moſt manifeſt) by ſenſible
perience, which ſhews us that in the Earth there are made
nual generations, corruptions, alterations, &c. which neither our
ſenſes, nor the traditions or memories of our Anceſtors, ever ſaw
an inſtance of in Heaven; therefore Heaven is unalterable, &c.

and the Earth alterable, &c. and therefore different from
ven. I take my ſecond Argument from a principal and eſſential
accident, and it is this. That body which is by its nature

ſcure and deprived of light, is divers from the luminous and
ning bodies; but the Earth is obſcure and void of light, and the
Cœleſtial bodies ſplendid, and full of light; Ergo, &c. Anſwer
to theſe Arguments firſt, that we may not heap up too many,
and then I will alledge others.

Heaven
ble, becauſe there
never was any
tation ſeen in it.

Bodies naturally
lucid, are different
from thoſe which
are by nature
ſcure.

SALV. As to the firſt, the ſtreſſe whereof you lay upon
perience, I deſire that you would a little more diſtinctly produce
me the alteration which you ſee made in the Earth, and not in
Heaven; upon which you call the Earth alterable, and the
vens not ſo.

SIMPL. I ſee in the Earth, plants and animals continually

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