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 Earth may be a Planet.
Prejudice the preſent Opinion, or common
Principles.
Ad 3. As the ſound of this Motion is not
more heard, than the Harmony of the Hea-
vens:
ſo neither is there any reaſon vvhy
this Motion ſhould cauſe a ſound, more than
the ſuppoſed Motion of the Heavens, vvhich
is likevviſe thought to be continued unto the
Air hard by us.
Ad 4. This vvill prove the Earth to move
as vvell as the Heavens;
For that has, firſt,
a round Figure, as is generally granted.
Secondly, Being conſidered as vvhole, and
in its proper place, it is not heavy, as vvas
proved before:
and as for the tvvo other
conditions, neither are they true of the
Heavens;
nor if they vvere, vvould they
at all conduce to their Motion.
Ad 5. This Argument vvould prove
that the Sea did not ebb and flow, becauſe
there is not the ſame kind of motion in eve-
ry drop of Water:
or that the whole Earth
is not ſpherical, becauſe every little piece of
it is not of the ſame Form.
Ad 6. This is rather an Illuſtration than
a Proof;
or if it do prove any thing, it may
ſerve as well for that purpoſe unto which it
is afterward applied, where the motion of
every Planet is fuppoſed to depend upon the
revolution of the Sun.
Ad 7. That the Sun and Planets do work
upon the Earth by their own real daily mo-
tion, is the thing in queſtion;
and there-
fore muſt not be taken for a common
Ground.

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