- 1. n. The act or state of librating. Source: opted
- 2. n. A real or apparent libratory motion, like that of a balance before coming to rest. Source: opted
- 3. n. (astronomy) a real or apparent slow oscillation of a moon or satellite Source: wordnet
- 4. 1. The act or state of librating. Jer. Taylor. 2. (Astron.) A real or apparent libratory motion, like that of a balance before coming to rest. Libration of the moon, any one of those small periodical changes in the position of the moon's surface relatively to the earth, in consequence of which narrow portions at opposite limbs become visible or invisible alternately. It receives different names according to the manner in which it takes place; as: (a) Libration in longitude, that which, depending on the place of the moon in its elliptic orbit, causes small portions near the eastern and western borders alternately to appear and disappear each month. (b) Libration in latitude, that which depends on the varying position of the moon's axis in respect to the spectator, causing the alternate appearance and disappearance of either pole. (c) Diurnal or parallactic libration, that which brings into view on the upper limb, at rising and setting, some parts not in the average visible hemisphere. Source: webster
- 5. A real or apparent libratory motion, like that of a balancebefore coming to rest. Libration of the moon, any one of those smallperiodical changes in the position of the moon's surface relativelyto the earth, in consequence of which narrow portions at oppositelimbs become visible or invisible alternately. It receives differentnames according to the manner in which it takes place; as: (a)Libration in longitude, that which, depending on the place of themoon in its elliptic orbit, causes small portions near the easternand western borders alternately to appear and disappear each month.(b) Libration in latitude, that which depends on the varying positionof the moon's axis in respect to the spectator, causing the alternateappearance and disappearance of either pole. (c) Diurnal orparallactic libration, that which brings into view on the upper limb,at rising and setting, some parts not in the average visiblehemisphere. Source: adambom
- 6. n:100 n. (astronomy) a real or apparent slow oscillation of a moon or satellite Source: ecdict
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