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Nach., No. 263 ; Pop. There is also a "parallactic" libration, depending on the earth's rotation; and a species of nodding movement the "libration in latitude" is produced by the inclination of the moon's axis to her orbit, and by her changes of position with regard to the terrestrial equator. Leo Brenner, Naturwiss. Wochenschrift, January 13, 1895; Jour. Brit. Astr.
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