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to be fixed on this vault; the moon, and
later the planets, were seen to crawl over
it. It was a great step to look on the vault
as a hollow sphere carrying the sun too. It
must have been difficult to believe that at
midday the stars are shining as brightly in
the blue sky as they do at night. It must
have been difficult to explain how the sun,
having set in the west, could get back to
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