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    Naturevolume 13page188 (1876) | Download Citation



    ENCKE'S COMET.—By the calculations of Encke and others who have continued them, we are in possession of the dates of perihelion passage of the comet which bears his name, from 1786 to 1875. If these be arranged and the intervals taken between the successive dates, it will be found that in the course of these ninety years the effect of perturbation has not changed the period of two successive revolutions by a hundredth part. The revolution 1819-1822 was 10.1 days longer than that between 1815 and 1819, and the revolution 1845-1848 was 11.1 days shorter than the preceding one, and these are the largest variations exhibited. In the same period, the longest interval between two successive arrivals at perihelion is 1215.6 days, 1842-1845, and the shortest 1200.2 days, 1868-1871.

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