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the method of using eclipses for determin-
ing the longitude.
In connection with Hipparchus’ great dis-
covery it may be mentioned that modern as-
tronomers have often attempted to fix dates
in history by the effects of precession of
the equinoxes. (1) At about the date when
the Great Pyramid may have been built
ˆ
IDraconis was near to the pole, and must
105
