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On the luminosity of the Earth in the universal space (874-878).
8
74.
In my book I propose to show, how the ocean and the other seas must,
by means of the sun, make our world shine with the appearance of a
moon, and to the remoter worlds it looks like a star; and this I
shall prove.
Show, first that every light at a distance from the eye throws out
rays which appear to increase the size of the luminous body; and
from this it follows that 2 ...[Footnote 10: Here the text breaks
off; lines 11 and fol. are written in the margin.].
[11]The moon is cold and moist. Water is cold and moist. Thus our
seas must appear to the moon as the moon does to us.
8
75.
The waves in water magnify the image of an object reflected in it.
Let a be the sun, and n m the ruffled water, b the image of
the sun when the water is smooth. Let f be the eye which sees the
image in all the waves included within the base of the triangle c e
f. Now the sun reflected in the unruffled surface occupied the
space c d, while in the ruffled surface it covers all the watery
714
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