Annual parallax
Definition of Annual parallax
the
greatest
value
of
the
heliocentric
parallax
,
or
the
greatest
annual
apparent
change
of
place
of
a
body
as
seen
from
the
earth
and
sun
;
it
is
equivalent
to
the
parallax
of
an
astronomical
object
which
would
be
observed
by
taking
observations
of
the
object
at
two
different
points
one
astronomical
unit
(
the
distance
of
the
Earth
from
the
sun
)
apart
,
if
the
line
joining
the
two
observing
points
is
perpendicular
to
the
direction
to
the
observed
object
;
as
,
the
annual parallax
of
a
fixed
star
.
The
distance
of
an
astronomical
object
from
the
Earth
is
inversely
proportional
to
the
annual parallax
.
A
star
which
has
an
annual
parallax
of
one
second
of
an
arc
is
considered
to
be
one
parsec
(
3
.
26
light
years
)
distant
from
the
earth
;
a
star
with
an
annual
parallax
of
one-hundredth
second
of
an
arc
is
326
light
years
distant
.
See
parsec
in
the
vocabulary
,
and
stellar
parallax
,
below
.
See also:
Parallax
Related Words
heliocentric
parallax
,
parallax
,
stellar
parallax
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