Last Updated
：2025/11/21
sidereal year
Noun
The
orbital
period
of
the
Earth;
a
measure
of
the
time
it
takes
for
the
Sun
to
return
to
the
same
position
with
respect
to
the
stars
of
the
celestial
sphere.
A
sidereal
year
is
about
20.4
minutes
longer
than
the
tropical
year
(which
is
what
is
kept
stable
by
the
Gregorian
calendar)
due
to
precession
of
the
equinoxes.
Japanese Meaning
恒星年：天球上の恒星に対して太陽が同じ位置に戻るまでの地球の公転周期。すなわち、地球が一周するのに要する時間で、太陽年（暦年）より約20.4分長い。
Sense（1）
The
orbital
period
of
the
Earth;
a
measure
of
the
time
it
takes
for
the
Sun
to
return
to
the
same
position
with
respect
to
the
stars
of
the
celestial
sphere.
A
sidereal
year
is
about
20.4
minutes
longer
than
the
tropical
year
(which
is
what
is
kept
stable
by
the
Gregorian
calendar)
due
to
precession
of
the
equinoxes.
（ plural ）
Quizzes for review
The orbital period of the Earth; a measure of the time it takes for the Sun to return to the same position with respect to the stars of the celestial sphere. A sidereal year is about 20.4 minutes longer than the tropical year (which is what is kept stable by the Gregorian calendar) due to precession of the equinoxes.
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See correct answer
sidereal year
Astronomers calculate the sidereal year to understand Earth's position relative to distant stars.
See correct answer
Astronomers calculate the sidereal year to understand Earth's position relative to distant stars.
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