Precession
Definition of Precession
Pre`ces´sion
n.
1.
The
act
of
going
before
,
or
forward
.
Lunisolar precession
(Astron.)
See
under
Lunisolar
.
Planetary precession
that
part
of
the
precession
of
the
equinoxes
which
depends
on
the
action
of
the
planets
alone
.
Precession of the equinoxes
(Astron.)
the
slow
backward
motion
of
the
equinoctial
points
along
the
ecliptic
,
at
the
rate
of
50
.
2
annually
,
caused
by
the
action
of
the
sun
,
moon
,
and
planets
,
upon
the
protuberant
matter
about
the
earth
'
s
equator
,
in
connection
with
its
diurnal
rotation
; -
so
called
because
either
equinox
,
owing
to
its
westerly
motion
,
comes
to
the
meridian
sooner
each
day
than
the
point
it
would
have
occupied
without
the
motion
of
precession
,
and
thus
precedes
that
point
continually
with
reference
to
the
time
of
transit
and
motion
.
Related Words
motion
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-Precession-
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