from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Plural form of libration.


Sorry, no etymologies found.


  • "librations," however, of Mercury are on a larger scale than those of the moon, because he travels in a more eccentric path.

    A Popular History of Astronomy During the Nineteenth Century Fourth Edition

  • He dealt with such topics as the motions of the fixed stars, the tropical year, the obliquity of the ecliptic, the problems resulting from the motion of the sun, the motions of the earth and the other planets, librations, longitude in the other five planets, and the apparent deviation of the planets from the ecliptic.

    Nicolaus Copernicus

  • That light lay forever in a band of incandescence upon the peaks two thousand feet above the settlement, moving up and down slightly as the weeks passed and the planet rocked through its annual librations.

    The Lost Worlds of 2001

  • With the aid of Campani's long telescope, he added four satellites of Saturn to the one that had been seen by Huyghens. he studied the causes of the librations of the moon, observed the zodiacal light, and developed a theory of the motion of comets.

    The Catholic Encyclopedia, Volume 3: Brownson-Clairvaux

  • Moon's librations, were _pretty certain_ that there is no great difference between her two sides, as far as regards their physical constitutions.

    All Around the Moon

  • You are, of course, aware that in consequence of her librations, or noddings, or wobblings, the Moon presents to the eyes of the Earth a little more than the exact half of her disc.

    All Around the Moon

  • Two lovers hide themselves in the evening, in the twilight, in the invisible, with the birds, with the roses; they fascinate each other in the darkness with their hearts which they throw into their eyes, they murmur, they whisper, and in the meantime, immense librations of the planets fill the infinite universe.

    Les Miserables, Volume IV, Saint Denis

  • But the fact is that these periods are not exactly the same, which causes the moon to actually have librations, which are small perturbations of the amount of the lunar surface that is observed from the Earth.

    NPR Topics: News

  • Another cause he thinks may be from the librations to one side, and to the other, of the crystalline lens in the eye, by means of involuntary actions of the muscles, which constitute the ciliary process.

    Zoonomia, Vol. I Or, the Laws of Organic Life

  • But as a greater torpor follows this exhaustion of sensorial power, as explained in the next paragraph, and a greater exertion succeeds this torpor, the constitution frequently sinks under these increasing librations between exertion and quiescence; till at length complete quiescence, that is, death, closes the scene.

    Zoonomia, Vol. I Or, the Laws of Organic Life


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