Abstract
IN the course of some work on comets lately communicated to the Royal Society of Edinburgh, in which I show reasons for believing that a planet more distant from the sun than Neptune is at present in the position R.A. 11h. 40m., N.P.D. 85°, or thereabouts, I was led to the conclusion that the comet 1861 I., visible to the naked eye, should have been in perihelion three times before the last appearance. The period of the comet has been calculated to be 415.4 years. It ought therefore to have been visible in the years 1445, 1031, 615. Comets were observed in 1444, 1032, 617. It will be interesting to many readers of NATURE to know that these are identical. They were all observed in July or August, and were all seen to pass close to β Leonis. The following accounts of them have been given:—
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FORBES, G. The Comet 1861 I. Nature 21, 562 (1880). https://doi.org/10.1038/021562b0
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DOI: https://doi.org/10.1038/021562b0
