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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10795That the Moon may be a World. tre of the Moon, than the outward Circumfe-
rence of the enlightned part.
But the Moon
being in the Full;
then does it ſeem to receive
theſe Stars within its Limb.
4. Though the Moon do ſometimes appear
the firſt day of her Change, when ſo much as
appears enlightned, cannot be above the 80 part
of her Diameter, yet then will the Horns
ſeem at leaſt to be of a Fingers breadth in Ex-
# Which could not be, unleſs the Air
about it were illuminated.
5. ’Tis obſerv'd, in the Solary Eclipſes, that
there is ſometimes a great Trepidation about
the Body of the Moon, from which we may
likewife argue an Atmo-ſphæra, ſince we can-
not well conceive what ſo probable a cauſe
there ſhould be of ſuch an appearance as this,
Quod radii Solares à vaporibus Lunam ambien-
Roſ. Vrſ. l.
4. pars. 2.
c. 27.
tibus fuerint interciſi, that the Sun beams were
broken and refracted by the Vapours that en-
compaſſed the Moon.
6. I may add the like Argument taken from
another Obſervation, which will be eaſily try-
ed and granted.
When the Sun is Eclipſed,
we diſcern the Moon as ſhe is in her own na-
tural bigneſs;
but then ſhe appears ſomewhat
leſs than when ſhe is in the Full, though ſhe
be in the ſame place of her ſuppos'd Excen-
trick and Epicycle;
and therefore Tycho hath
Calculated a Table for the Diameter of the di-
vers New Moons.
But now there is no reaſon
ſo probable, to ſalve this appearance, as to
place an Orb of thicker Air, near the Body
of that Planet, which may be enlightned by
the reſlected Beams, and through which

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