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tions with those of more ancient astronomers,
supplied an accurate value of the moon’s
mean motion in his time. Halley similarly
deduced a value for modern times, and found
it sensibly greater. He announced this in
1693, but it was not until 1749 that Dun-
thorne used modern lunar tables to com-
pute a lunar eclipse observed in Babylon
721 B.C., another at Alexandria 201 B.C.,
284