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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308128That the Earth may be a Planet. the Cannon vvhich is upon the Earth, toge-
ther vvith the Bullet in it, do partake of the
ſame Circular Motion vvith the Earth;
this perhaps our Adverſaries vvill grant,
vvhilſt vve ſuppoſe the Bullet to remain
ſtill in the Cannon, all the difficulty vvill
be, to ſhevv hovv it muſt neceſſarily obſerve
the ſame motion, vvhen it is ſhot out into
the open Air.
For the better explication of this, you may
11Gallil. Syſt
Collaq. 2.
note this follovving Figure.
12[Figure 12]
Where vve ſuppoſe AC to be a Cannon
perpendicularly erected, vvith a Bullet in it
at B;
vvhich if it vvere immovable, vve
grant that the Bullet being diſcharged, muſt
aſcend in a juft perpendicular.
But novv,
conceive this Cannon to move along vvith
the Earth, then in that ſpace of time, vvhile
the Bullet, by the force of the Povvder, is
aſcending to the top of the Bore, the

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