最終更新日：2024/07/29
(astronomy) The three laws of planetary motion discovered by Kepler in the early 17th century, stating that (i) the orbit of a planet is an ellipse with the Sun at one of the two foci, (ii) a line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time, and (iii) the square of the orbital period of a planet is proportional to the cube of the semi-major axis of its orbit.
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Kepler's laws
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Kepler's laws
noun
(astronomy)
The
three
laws
of
planetary
motion
discovered
by
Kepler
in
the
early
17th
century,
stating
that
(i)
the
orbit
of
a
planet
is
an
ellipse
with
the
Sun
at
one
of
the
two
foci,
(ii)
a
line
segment
joining
a
planet
and
the
Sun
sweeps
out
equal
areas
during
equal
intervals
of
time,
and
(iii)
the
square
of
the
orbital
period
of
a
planet
is
proportional
to
the
cube
of
the
semi-major
axis
of
its
orbit.
意味（1）
(astronomy)
The
three
laws
of
planetary
motion
discovered
by
Kepler
in
the
early
17th
century,
stating
that
(i)
the
orbit
of
a
planet
is
an
ellipse
with
the
Sun
at
one
of
the
two
foci,
(ii)
a
line
segment
joining
a
planet
and
the
Sun
sweeps
out
equal
areas
during
equal
intervals
of
time,
and
(iii)
the
square
of
the
orbital
period
of
a
planet
is
proportional
to
the
cube
of
the
semi-major
axis
of
its
orbit.
