Page 602 - 89 history of astronomy_opt

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years; I Serpentis, 375 years; I Leonis, 1,200
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years; I Bootis, 1,681 years.
Twenty years later Sir John Herschel and
Sir James South, after re-examination of
these stars, confirmed[12] and extended the
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results, one pair of CoronA having in the
interval completed more than a whole rev-
olution.
It is, then, to Sir William Herschel that
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