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eration at that date of Jupiter’s mean mo-
tion, and indicated the retardation of Sat-
urn’s mean motion.
Horrocks’ investigations, so far as they
could be collected, were published posthu-
mously in 1672, and seldom, if ever, has a
man who lived only twenty-two years orig-
inated so much scientific knowledge.
At this period British science received a
240
