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ens; and with rings to show the ecliptic
and zodiac, as well as the equinoctial and
solstitial colures; but we have no record.
We only know that the tower of Belus, on
an eminence, was their observatory. We
have, however, distinct records of two such
spheres used by the Chinese about 2500 B.C.
Gnomons, or some kind of sundial, were
used by the Egyptians and others; and many
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