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 Moon may be a World.
Aggregate of the quadrate from A B a
Hundred, and B G a 1000.
will be 1010000.
unto which the Quadrat ariſing from A G
muſt be equal;
according to the 47th Propoſi-
tion in the ſirſt Book of Elements.
There-
fore the whole Line A G is ſomewhat more
than 104.
and the diſtance betwixt H A muſt
be above four Miles, which was the thing to
be prov'd.
But it may be again Objected, if there be
ſuch rugged parts, and ſo high Mountains, why
then cannot we diſcern them at this diſtance ?
why doth the Moon appear unto us ſo exactly
round, and not rather as a Wheel with Teeth.
I anſwer, by reaſon of too great a diſtance;
For if the whole Body appear to our Eye ſo
little, then thoſe parts which bear ſo ſmall a
proportion to the whole, will not at all be ſen-
ſible.
But it may be replyed, if there were any
ſuch remarkable Hills, why does not the Limb
of the Moon appear like a Wheel with Teeth,
to thoſe who look upon it through the great
Perſpective, on whoſe Witneſs you ſo much
depend?
Or what reaſon is there that ſhe ap-
pears as exactly round through it, as ſhe doth
to the bare Eye?
Certainly then, either there
is no ſuch thing as you imagin, or elſe the
Glaſs fails much in this Diſcovery.
To this I ſhall anſwer out of Galilæus.
1. You muſt know that there is not meer-
ly one rank of Mountains about the edge of
the Moon, but divers Orders, one Mountain
behind another, and ſo there is ſomewhat to
hinder thoſe void ſpaces, which otherwiſe, per-
haps, might appear.

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