Galilei, Galileo, The systems of the world, 1661

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SALV. Now I remember the reſt, and to proceed, Methinks
there are ſome things in the anſwer of Anti-Tycho, worthy of
reprehenſion.
And firſt, if the two New Stars, which he can do
no leſs than place in the uppermoſt parts of the Heavens, and
which were of a long duration, but finally vaniſhed, give him no
obſtruction in maintaining the inalterability of Heaven, in that
they were not certain parts thereof, nor mutations made in the
antient Stars, why doth he ſet himſelf ſo vigorouſly and earneſtly
againſt the Comets, to baniſh them by all ways from the
ſtial Regions?
Was it not enough that he could ſay of them
the ſame which he ſpoke of the New ſtars?
to wit, that in
gard they were no certain parts of Heaven, nor mutations made
in any of the Stars, they could no wiſe prejudice either Heaven,
or the Doctrine of Ariſtotle? Secondly, I am not very well
fied of his meaning; when he ſaith that the alterations that ſhould
be granted to be made in the Stars, would be deſtructive to the
prerogative of Heaven; namely, its incorruptibility, &c. and
this, becauſe the Stars are Cœleſtial ſubſtances, as is manifeſt
by the conſent of every one; and yet is nothing troubled that

the ſame alterations ſhould be made ^{*} without the Stars in the reſt
of the Cœleſtial expanſion.
Doth he think that Heaven is no
Cœleſtial ſubſtance?
I, for my part, did believe that the Stars
were called Cœleſtial bodies, by reaſon that they were in
ven, or for that they were made of the ſubſtance of Heaven;
and yet I thought that Heaven was more Cœleſtial than they; in
like ſort, as nothing can be ſaid to be more Terreſtrial, or more
fiery than the Earth or Fire themſelves.
And again, in that he
ver made any mention of the Solar ſpots, which have been
dently demonſtrated to be produced, and diſſolved, and to be
neer the Sun, and to turn either with, or about the ſame, I have
reaſon to think that this Author probably did write more for others
pleaſure, than for his own ſatisfaction; and this I affirm,
much as he having ſhewn himſelf to be skilful in the
ticks, it is impoſſible but that he ſhould have been convinced by
Demonſtrations, that thoſe ſubſtances are of neceſſity
ous with the body of the Sun, and are ſo great generations and
corruptions, that none comparable to them, ever happen in the
Earth: And if ſuch, ſo many, and ſo frequent be made in the
very Globe of the Sun, which may with reaſon be held one of the
nobleſt parts of Heaven, what ſhould make us think that others
may not happen in the other
* Ex tra Stellas.
Generability and
alteration is a
greater perfection
in the Worlds
dies than the
trary qualities.
SAGR. I cannot without great admiration, nay more,
al of my underſtanding, hear it to be attributed to natural bodies,
for a great honour and perfection that they are ^{*} impaſſible,
mutable, inalterable, &c. And on the contrary, to hear it to

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