Libration of the moon

Definition of 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.

See also: Libration

Word:

Browse

Liberty cap
Liberty of the press
Liberty of the yard
Liberty party
Liberty pole
Libethenite
libidinal
Libidinist
Libidinosity
Libidinous
libido
Libken
Libocedrus
Libra
Libral
Librarian
Librarianship
Library
Librate
Libration
-Libration of the moon-
Libration point
Libratory
Librettist
Libretto
Libriform
Libriform cells
Libya
Libyan
Lice
licence
Licensable
License
Licensed
Licensed victualer
Licensee
Licenser
Licensure
Licentiate
Licentious
Lich
# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

© 2014 Delaflex, Inc.Dictionary Home | Privacy Policy