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
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libido
Libken
Libocedrus
Libra
Libral
Librarian
Librarianship
Library
Librate
Libration
-Libration of the moon-
Libration point
Libratory
Librettist
Libretto
Libriform
Libriform cells
Libya
Libyan
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