Wilkins, John, A discovery of a new world : or a discourse tending to prove, that 'tis probable there may be another Habitable World in the Moon ; with a discourse concerning the Probability of a Passage thither; unto which is added, a discourse concerning a New Planet, tending to prove, that 'tis probable our earth is one of the Planets

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That the Eartb may be a Planet.
tude is fifty Thirds, which is comprehended
in that of the Sun 2160 times.
Now if the
Sun were removed ſo far from us, that its
Diameter would ſeem but as one of that
number whereof it now contains 2160, then
muſt his diſtance from us be 2160 times
greater than now it is:
which is all one, as
if we ſhould ſay, that a Star of the ſixth
Magnitude is ſevered from us by ſo many Se-
midiameters of the Earth's Orb.
But now,
according to common conſent, the diſtance
of the Earth from the Sun, does contain 128
Semidiameters of the Earth;
and (as was
faid before) this ſuppoſed diſtance of the
fixed Stars, does comprehend 2160 Semi-
diameters of the Earth's Orb.
From whence
it is manifeſt, that the Semidiametey of the
Earth, in compariſon to its diſtance from the
Sun, will be almoſt doubly bigger than the
Semidiameter of the Earth's Orb, in com-
pariſon to this diſtance of the Stars.
But
now the Semidiameter of the Earth, does
make very little difference in the appear-
ance of the Sun, becauſe we ſee common
Obſervations upon the Surface of it, are as
exactly true to the ſenſe, as if they were
made from the Centre of it.
Wherefore,
that difference which would be made in
theſe fixed Stars, by the annual courſe of
the Earth, muſt needs be much more unob-
fervable, or rather altogether inſenſible.
2. The Conſequence of this Argument, is
grounded upon this falfe ſuppoſition, That
every Body muſt neceſſarily be of an equal