1nor a leſſe mutation being diſcerned in the fixed Stars, methinks
that by this means the annual motion of the Earth is deſtroyed
and overthrown.
that by this means the annual motion of the Earth is deſtroyed
and overthrown.
SALV. You might very well ſo conclude, Simplicius, if we
had nothing elſe to ſay in behalf of Copernicus: but we have
many things to alledge that yet have not been mentioned; and
as to that your reply, nothing hindereth, but that we may
poſe the diſtance of the fixed Stars to be yet much greater than
that which hath been allowed them, and you your ſelf, and
ever elſe will not derogate from the propoſitions admitted by
Piolomy's ſectators, muſt needs grant it as a thing moſt requiſite
to ſuppoſe the Starry Sphere to be very much bigger yet than
that which even now we ſaid that it ought to be eſteemed. For
all Aſtronomers agreeing in this, that the cauſe of the greater
tardity of the Revolutions of the Planets is, the majority of
their Spheres, and that therefore Saturn is more flow than
piter, and Jupiter than the Sun, for that the firſt is to deſcribe a
greater circle than the ſecond, and that than this later, &c.
ſidering that Saturn v.g. the altitude of whoſe Orb is nine times
higher than that of the Sun, and that for that cauſe the time of
one Revolution of Saturn, is thirty times longer than that of a
converſion of the Sun, in regard that according to the Doctrine
of Ptolomy, one converſion of the ſtarry Sphere is finiſhed in
36000. years, whereas that of Saturn is conſummate in thirty,
and that of the Sun in one, arguing with a like proportion, and
ſaying, if the Orb of Saturn, by reaſon it is nine times bigger
than that of the Sun, revolves in a time thirty times longer, by
converſion, how great ought that Orb to be, which revolves
36000. times more ſlowly? it ſhall be found that the diſtance of
the ſtarry Sphere ought to be 10800 ſemidiameters of the grand
Orb, which ſhould be full five times bigger than that, which even
now we computed it to be, in caſe that a fixed Star of the ſixth
magnitude were equal to the Sun. Now ſee how much leſſer yet,
upon this account, the variation occaſioned in the ſaid Stars, by
the annual motion of the Earth, ought to appear. And if at the
ſame rate we would argue the diſtance of the ſtarry Sphere from
Jupiter, and from Mars, that would give it us to be 15000. and
this 27000 ſemidiameters of the grand Orb, to wit, the firſt
ſeven, and the ſecond twelve times bigger than what the
nitude of the fixed Star, ſuppoſed equal to the Sun, did make
it.
had nothing elſe to ſay in behalf of Copernicus: but we have
many things to alledge that yet have not been mentioned; and
as to that your reply, nothing hindereth, but that we may
poſe the diſtance of the fixed Stars to be yet much greater than
that which hath been allowed them, and you your ſelf, and
ever elſe will not derogate from the propoſitions admitted by
Piolomy's ſectators, muſt needs grant it as a thing moſt requiſite
to ſuppoſe the Starry Sphere to be very much bigger yet than
that which even now we ſaid that it ought to be eſteemed. For
all Aſtronomers agreeing in this, that the cauſe of the greater
tardity of the Revolutions of the Planets is, the majority of
their Spheres, and that therefore Saturn is more flow than
piter, and Jupiter than the Sun, for that the firſt is to deſcribe a
greater circle than the ſecond, and that than this later, &c.
ſidering that Saturn v.g. the altitude of whoſe Orb is nine times
higher than that of the Sun, and that for that cauſe the time of
one Revolution of Saturn, is thirty times longer than that of a
converſion of the Sun, in regard that according to the Doctrine
of Ptolomy, one converſion of the ſtarry Sphere is finiſhed in
36000. years, whereas that of Saturn is conſummate in thirty,
and that of the Sun in one, arguing with a like proportion, and
ſaying, if the Orb of Saturn, by reaſon it is nine times bigger
than that of the Sun, revolves in a time thirty times longer, by
converſion, how great ought that Orb to be, which revolves
36000. times more ſlowly? it ſhall be found that the diſtance of
the ſtarry Sphere ought to be 10800 ſemidiameters of the grand
Orb, which ſhould be full five times bigger than that, which even
now we computed it to be, in caſe that a fixed Star of the ſixth
magnitude were equal to the Sun. Now ſee how much leſſer yet,
upon this account, the variation occaſioned in the ſaid Stars, by
the annual motion of the Earth, ought to appear. And if at the
ſame rate we would argue the diſtance of the ſtarry Sphere from
Jupiter, and from Mars, that would give it us to be 15000. and
this 27000 ſemidiameters of the grand Orb, to wit, the firſt
ſeven, and the ſecond twelve times bigger than what the
nitude of the fixed Star, ſuppoſed equal to the Sun, did make
it.
All
mers agree that
the greater
tudes of the Orbes
is the cauſe of the
tardity of the
verſions.
mers agree that
the greater
tudes of the Orbes
is the cauſe of the
tardity of the
verſions.
By another
poſition taken from
Aſtronomers, the
diſtance of the
ed Stars is
lated to be 10800
ſemidiameters of
the grand Orb.
poſition taken from
Aſtronomers, the
diſtance of the
ed Stars is
lated to be 10800
ſemidiameters of
the grand Orb.
By the proportion
of Jupiter and of
Mais, the ſtarry
Sphere is found to
be yet more remote.
of Jupiter and of
Mais, the ſtarry
Sphere is found to
be yet more remote.
SIMP. Methinks that to this might be anſwered, that the
tion of the ſtarry Sphere hath, ſince Ptolomy, been obſerved not
to be ſo ſlow as he accounted it; yea, if I miſtake. not, I have
heard that Copernicus himſelf made the Obſervation.
tion of the ſtarry Sphere hath, ſince Ptolomy, been obſerved not
to be ſo ſlow as he accounted it; yea, if I miſtake. not, I have
heard that Copernicus himſelf made the Obſervation.
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