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a solar eclipse observed by Theon 360 A.D.,
and two later ones up to the tenth century.
He found that to explain these eclipses Hal-
ley’s suggestion must be adopted, the accel-
eration being 10” in one century. In 1757
Lalande again fixed it at 10.”
The Paris Academy, in 1770, offered their
prize for an investigation to see if this could
be explained by the theory of gravitation.
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