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Approximate periods were fixed for many of the revolving suns for Castor 342 years; for Gamma Leonis, 1200, Delta Serpentis, 375, Eta Bootis, 1681 years; Eta Lyræ was noted as a "double-double-star," a change of relative situation having been detected in each of the two pairs composing the group; and the occultation was described of one star by another in the course of their mutual revolutions, as exemplified in 1795 by the rapidly circulating system of Zeta Herculis.
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