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A treatise on astronomy, descriptive, physical and practical. Designed for schools, colleges, and private students (1849)

Robinson, Horatio N. (Horatio Nelson), 1806-1867 · Albany, N.Y., E.H. Pease & Co.; [etc., etc.] · leaf 163

An illustration from A treatise on astronomy, descriptive, physical and practical. Designed for schools, colleges, and private students, 1849, leaf 163 — nged to different appearances of the same comet. Butthis condition is not rigorously necessary ; for the elements of theorbit may, like those of other heavenly bodies, have undergone changesfrom the perturbations of the planets or their mutual attractions. Con-sequently, we have only to see whether… … verified. Dr.Halleys Dr. Halley remarked that the comets observed in 1531, 1607, 1682,prediction had nearly the same elements ; and he hence concluded that they be-longed to the same comet, which, in 151 years, made two revolutions,its period being about 76 years. It actually appeared in 1759,…

Astronomy

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