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articles of moisture, each of which independently, when the
ays of the sun fall upon it, reflects a radiance, and so these
umberless bright particles conceal the stars; and if it were not
or this atmosphere the sky would always display the stars against
ts darkness.
[Footnote: See No. 296, which also refers to starlight.]
9
12.
Whether the stars have their light from the sun or in themselves.
Some say that they shine of themselves, alledging that if Venus
nd Mercury had not a light of their own, when they come between
ur eye and the sun they would darken so much of the sun as they
ould cover from our eye. But this is false, for it is proved that
dark object against a luminous body is enveloped and entirely
oncealed by the lateral rays of the rest of that luminous body
nd so remains invisible. As may be seen when the sun is seen
hrough the boughs of trees bare of their leaves, at some distance
he branches do not conceal any portion of the sun from our eye.
he same thing happens with the above mentioned planets which,
hough they have no light of their own, do not--as has been said--
onceal any part of the sun from our eye
[18].
SECOND ARGUMENT.
Some say that the stars appear most brilliant at night in proportion
as they are higher up; and that if they had no light of their own,
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