Last Updated：2025/11/21
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In physics class, we used Kepler's laws to explain why planets move faster when they are closer to the Sun.
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In physics class, we used Kepler's laws to explain why planets move faster when they are closer to the Sun.
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Related words
Kepler's laws
Noun
plural
plural-only
(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.
Japanese Meaning
ケプラーの法則：17世紀初頭にケプラーが発見した、惑星の運動に関する3つの法則。具体的には、(1) 惑星の軌道は太陽を一つの焦点とする楕円である、(2) 惑星と太陽を結ぶ直線が等しい時間ごとに等面積を掃く、(3) 惑星の公転周期の二乗は軌道の長半径の三乗に比例するという法則。
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