最終更新日：2025/11/19
One of the two occasions in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun (the ecliptic) intersects with the equatorial plane of the Earth; this happens on a day between March 19 and 21 (spring in the Northern Hemisphere, and autumn in the Southern Hemisphere), and on another day between September 21 and 24 (autumn in the Northern Hemisphere, and spring in the Southern Hemisphere); hence, the exact time when the intersection occurs.
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equinox
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元となった辞書の項目
equinox
IPA（発音記号）
名詞
未分類
比喩的用法
廃用
稀用
One
of
the
two
occasions
in
the
year
when
the
length
of
the
day
and
night
are
equal,
which
occurs
when
the
apparent
path
of
the
Sun
(the
ecliptic)
intersects
with
the
equatorial
plane
of
the
Earth;
this
happens
on
a
day
between
March
19
and
21
(spring
in
the
Northern
Hemisphere,
and
autumn
in
the
Southern
Hemisphere),
and
on
another
day
between
September
21
and
24
(autumn
in
the
Northern
Hemisphere,
and
spring
in
the
Southern
Hemisphere);
hence,
the
exact
time
when
the
intersection
occurs.
日本語の意味
昼夜の長さがほぼ等しくなる瞬間、すなわち太陽が赤道面と交差する（春分または秋分の日に相当する）日を指す。
意味（1）
One
of
the
two
occasions
in
the
year
when
the
length
of
the
day
and
night
are
equal,
which
occurs
when
the
apparent
path
of
the
Sun
(the
ecliptic)
intersects
with
the
equatorial
plane
of
the
Earth;
this
happens
on
a
day
between
March
19
and
21
(spring
in
the
Northern
Hemisphere,
and
autumn
in
the
Southern
Hemisphere),
and
on
another
day
between
September
21
and
24
(autumn
in
the
Northern
Hemisphere,
and
spring
in
the
Southern
Hemisphere);
hence,
the
exact
time
when
the
intersection
occurs.
意味（2）
意味（3）
意味（4）
（ plural ）
（ plural rare ）
