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Libration - Wikipedia, the free encyclopedia
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English: Lunar libration ... (Geometrically impossible, but best demonstration of monthly libration caused by moon's motion versus the shorter daily libration that would be included from the surface of the earth. ... English: Lunar libration. see below for more descriptions...
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An optional section on lunar librations, part of a course on astronomy, Newtonian mechanics and spaceflight ... Two-pan weighing scales can oscillate like a pendulum, back and forth across their equilibrium position, and supposedly the libration of the Moon resembles such motion.
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Libration - Definition of Libration at Dictionary.com a free online dictionary with pronunciation, synonyms, and translation of Libration. Look it up now! ... Use libration in a Sentence...
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October 2003 Feature: Lunar Libration ... There are various causes for libration. There are also different kinds of libration: libration of longitude and libration of latitude. ... Libration of longitude, the Moon's east-west wobble, is a product of the Moon's elliptical (elongated) orbit. Although the Moon's rotation is...
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The major part of the Moon's libration in longitude is due to its spinning like a top at constant velocity (relative to the stars), yet travelling in an elliptical orbit (which causes our angle of viewing it to change at a varying speed).
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The libration points, also called the equilibrium or Lagrangian points, are solutions to the equations of motion for the spacecraft such that the x, y, and z positions and x, y, and z velocities are all 0. So to compute the location of these points, one must solve the equations of motion under these special conditions.
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This animation, covering a full lunation, dramatically illustrates libration of latitude and of longitude. Notice also how much the Moon's apparent size changes from perigee (its closest approach to the Earth) to apogee (when it is at its furthest), and how features near the edges are distorted and even appear...
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Libration in latitude is due to the Moon's axis being slightly inclined relative to the Earth's. Each of the lunar poles will appear to be alternately tipped slightly toward the terrestrial observer over a roughly four week cycle.
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The left Moon image shows an unfavorable northeastern libration (L:-4.463, B:-5.545) as compared to the right image with a favorable northeastern libration (L:6.979, B:4.707). Notice how close the Endymion crater and the Mare Crisium are to the edge of the Moon in the left image as compared to the right image.
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