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北半球の春分の日の時刻
2022年 Sunday, March 20, at 11:33 A.M
2023年 Monday, March 20, at 5:24 P.M.
2024年 Tuesday, March 19, at 11:06 P.M.
2025年 Thursday, March 20, at 5:01 A.M.
こんなに差があるものなの？
驚いた
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ということで「春分の日って毎年同じ日なの？」という疑問に対する回答：
Is the spring equinox on the same day every year?
The vernal equinox happens on March 19, 20, or 21 every year in the Northern Hemisphere.
北半球では 3月19日か20日か21日。
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秋分の日について：
Most years, this happens on either Sept. 22 or 23.
たいてい9月22日か23日。
しかし
However, every once in a while, the autumn equinox can occur on Sept. 21 or 24.
時々9月21日や24日にずれる年もある。
9月24日にずれた年って経験したこと無いような？
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質問
なぜ秋分の日は毎年同じ日じゃないの？
Why the Autumnal Equinox Doesn't Fall on the Same Day Every Year
By Hanneke Weitering published September 22, 2018
回答
Autumn is right around the corner for everyone in the Northern Hemisphere, while those in the Southern Hemisphere are gearing up for warmer spring weather.
Depending on the part of the world in which you live, the season will change on either Sept. 22 or 23. That's because the equinox isn't a daylong event. Rather, the equinox is defined by the position of the Earth and the sun at a particular moment in time.
Time zones aren't the only source of confusion concerning the date of the equinox. Further complicating our calendars, the autumnal equinox can occur anytime between Sept. 21 and 24. [Autumn Equinox: 5 Odd Facts About Fall]
アメリカ東海岸では2018年の秋分の日は9月22日の午後9時54分で
The autumnal equinox arrives on Sept. 22, 2018, at 9:54 p.m. EDT (0154 GMT on Sept. 23).
これはグリニッジ時間では9月23日の午前1時54分。
え゛〜〜〜〜〜
時差で日付が変わるって忘れてたよ
真珠湾攻撃は日本じゃ1941年12月8日だけどハワイじゃ12月7日だったもんね
On Sept. 22 at 9:54 p.m. EDT (0154 GMT on Sept. 23), the sun will cross the celestial equator, or an imaginary line that projects Earth's equator into space. At this exact moment, the Northern and Southern hemispheres will receive an equal amount of sunshine, and the length of day and night will be approximately equal ほぼ等しい around the world — hence the term "equinox," which is derived from the Latin phrase meaning "equal night."
However, the situation is a bit different at Earth's poles. At the South Pole, where the sun hasn't risen for the last six months, the sun will finally peep over the horizon, and it remain in the sky for the next six months. Likewise, the North Pole will shift from being in sunlight 24/7 to being in the dark for the next six months. When the vernal equinox arrives on March 20, 2019, the South Pole will once again be in the dark, and the North Pole will bask in daylight for the first time since the autumnal equinox.
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わたしの理科力、小学校低学年レベルだな。
恥
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