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Sidereal year
Meaning
Noun
●
In Astronomy & Years:
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.
●
The time it
takes for
any
astronomical
object
in
orbit
around a
central
star
to
orbit
that
star
,
with respect to
distant
star
s.
Sourced from
Wiktionary
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