Last Updated：2025/11/28
(astronomy, celestial mechanics) An imaginary celestial body (corresponding to another, real, orbiting one) which orbits with constant speed along an auxiliary circle (a circle which shares a diameter with the major axis of the elliptical orbit of the corresponding real celestial body), such that its position coincides with the position of the corresponding, real celestial body when that body passes through periapsis.
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mean planet
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Source Word
mean planet
Noun
(astronomy,
celestial
mechanics)
An
imaginary
celestial
body
(corresponding
to
another,
real,
orbiting
one)
which
orbits
with
constant
speed
along
an
auxiliary
circle
(a
circle
which
shares
a
diameter
with
the
major
axis
of
the
elliptical
orbit
of
the
corresponding
real
celestial
body),
such
that
its
position
coincides
with
the
position
of
the
corresponding,
real
celestial
body
when
that
body
passes
through
periapsis.
Japanese Meaning
天体力学において、実際の惑星の楕円軌道に対応する補助円上を一定速度で公転する仮想の天体。実際の惑星が近日点を通過する際にその位置と一致するように計算上設定される参考天体。
Sense（1）
(astronomy,
celestial
mechanics)
An
imaginary
celestial
body
(corresponding
to
another,
real,
orbiting
one)
which
orbits
with
constant
speed
along
an
auxiliary
circle
(a
circle
which
shares
a
diameter
with
the
major
axis
of
the
elliptical
orbit
of
the
corresponding
real
celestial
body),
such
that
its
position
coincides
with
the
position
of
the
corresponding,
real
celestial
body
when
that
body
passes
through
periapsis.
（ plural ）
