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Updated: May 3, 2025
The second of these bodies to affect a looked-for return was a comet the sixteenth within ten years discovered by Pons, July 20, 1812, and found by Encke to revolve in an elliptic orbit, with a period of nearly 71 years. It was not, however, until September 1, 1883, that Mr. Brooks caught its reappearance; it passed perihelion January 25, and was last seen June 2, 1884.
By looking to the next two or three succeeding wing-feathers, an absolutely insensible gradation can be traced from one of the last-described basal spots, together with the next higher one in the same row, to a curious ornament, which cannot be called an ocellus, and which I will name, from the want of a better term, an "elliptic ornament." We here see several oblique rows, A, B, C, D, etc.
The four lantern arches have the flattened shape of the latest Gothic; but, oddly enough, the variety here chosen is the English four-centred arch, not the usual French shape, three-centred, elliptic, or actually flat-headed. But both the English and the French form are quite unsuited for pier-arches, and for lantern arches yet more.
Since that date fourteen comets have been found with elliptic orbits, whose aphelion distances are all about the same as Jupiter's mean distance; and six have an aphelion distance about ten per cent, greater than Neptune's mean distance. Other comets are similarly associated with the planets Saturn and Uranus.
Ever since Halley discovered that the comet of 1682 was a member of the solar system, these wonderful objects have had a new interest for astronomers; and a comparison of orbits has often identified the return of a comet, and led to the detection of an elliptic orbit where the difference from a parabola was imperceptible in the small portion of the orbit visible to us.
Some are elliptic, but, for the greater part round: some represent an hemisphere, others a segment, others an hyperbola. The glossopetrae are naturally of a conic figure, representing acute, obtuse, regular, and irregular cones.
These planets mutually attract each other, and in consequence of their mutual attractions the orbits of the planets are disturbed from the simple elliptic form which they would otherwise possess. The movement of the earth, for instance, is not, strictly speaking, performed in an elliptical orbit.
Lexell was the first to suspect that this was a new planet eighteen times as far from the sun as the earth is. In January, 1783, Laplace published the elliptic elements. The discoverer of a planet has a right to name it, so Herschel called it Georgium Sidus, after the king. But Lalande urged the adoption of the name Herschel. Bode suggested Uranus, and this was adopted.
Immersed in a subject with which they were all familiar, they were allusive, elliptic, and persistently technical. Many of the words I did catch were unknown to me. The rest were, for the most part, either letters of the alphabet or statistical figures, of depth, distance, and, once or twice, of time.
The spectroscope using the photographic plate, has established within the last decade that one star in every five or six on the average is attended by a companion so near to it as to remain invisible in the most powerful telescopes, and so massive as to swing the visible star around in an elliptic orbit.
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