Galilei, Galileo, The systems of the world, 1661

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1comes from the reflection of the light of the Sun on the
cies of the Earth and Sea; and that light is more clear, by how
much the horns are leſſe, for then the luminous part of the Earth,
beheld by the Moon, is greater, according to that which was
a little before proved; to wit, that the luminous part of the Earth,
expoſed to the Moon, is alway as great as the obſcure part of
the Moon, that is viſible to the Earth; whereupon, at ſuch time
as the Moon is ſharp-forked, and conſequently its tenebrous part
great, great alſo is the illuminated part of the Earth beheld from
the Moon, and its reflection of light ſo much the more potent.
Light reflected
from the Earth
to the Moon.
SALV. This is exactly the ſame with what I was about to ſay.
In a word, it is a great pleaſure to ſpeak with perſons judicious
and apprehenſive, and the rather to me, for that whileſt others
converſe and diſcourſe touching Axiomatical truths, I have
ny times creeping into my brain ſuch arduous Paradoxes, that
though I have a thouſand times rehearſed this which you at the
ry firſt, have of your ſelf apprehended, yet could I never beat
it into mens brains.
SIMPL. If you mean by your not being able to perſwade them
to it, that you could not make them underſtand the ſame, I
much wonder thereat, and am very confident that if they did
not underſtand it by your demonſtration (your way of expreſſion,
being, in my judgment, very plain) they would very hardly have
apprehended it upon the explication of any other man; but if
you mean you have not perſwaded them, ſo as to make them
lieve it, I wonder not, in the leaſt, at this; for I confeſſe my
ſelf to be one of thoſe who underſtand your diſcourſes, but
am not ſatisfied therewith; for there are in this, and ſome of
the other ſix congruities, or reſemblances, many difficulties,
which I ſhall inſtance in, when you have gone through them
all.
SALV. The deſire I have to find out any truth, in the acquiſt
whereof the objections of intelligent perſons (ſuch as your ſelf)
may much aſſiſt me, will cauſe me to be very brief in diſpatching
that which remains.
For a ſeventh conformity, take their

procal reſponſion as well to injuries, as favours; whereby the
Moon, which very often in the height of its illumination, by the
interpoſure of the Earth betwixt it and the Sun, is deprived of
light, and eclipſed, doth by way of revenge; in like manner,
terpoſe it ſelf between the Earth and the Sun, and with its ſhadow
obſcureth the Earth; and although the revenge be not
able to the injury, for that the Moon often continueth, and
that for a reaſonable long time, wholly immerſed in the Earths
ſhadow, but never was the Earth wholly, nor for any long time,
eclipſed by the Moon; yet, nevertheleſſe, having reſpect to the

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