110 Autumnal Equinox(秋分、秋の始まる日, September 22, 2016)  日本 対 アメリカ

Vernal equinox (春分), Summer solstice(夏至), Autumnal equinox(秋分), and Winter solstice(冬至)

日本では、春分の日と秋分の日は、国民の祝日として祝います。 夏至と冬至は、カレンダーで、知るだけのことが多いと思います。

アメリカでは、春分、夏至、秋分、および冬至のいずれの日も、カレンダーで、知るだけのことが多いと思います。 とにかく、このいずれの日も休みになりません。

と言う言葉は、ラテン語の“aequinoctium" から由来しています;  "aequus" (equal) + "nox" (night). "equinox" は、夜と昼の時間が、等しくなる時をさします。< http://www.religioustolerance.org/fall_equinox.htm  > 

Autumnal Equinox
(秋分)  < http://en.wikipedia.org/wiki/Equinox >
Seasons of the Year
(四季)< http://www.phy6.org/stargaze/Sseason.htm >

September 22, 2016  Autumnal Equinox (First Day of Fall)

10201 150923  Autumnal Equinox (First Day of Fall) 秋分の日  Letter 110 | レター 110  Sep. 23, 2015
The Autumn Equinox is Here! Wait, What's the Autumn Equinox?  National Geographic

7254 140924  Earth at Equinox  "Astronomy Photo of the Day" by NASA  September 22, 2014, Video taken by the Russian meteorological satellite Elektro-L during last year's September equinox.
Saturn at Equinox  "Astronomy Photo of the Day" by NASA  September 21, 2014, photo
Credit: Cassini Imaging Team, ISS, JPL, ESA, NASA
7231 140922  September 22, 2014    Autumnal Equinox: First Day of Fall
Letter 110
Autumnal Equinox (First Day of Fall, September 22, 2014)    USA vs. Japan
Equinoxes  video National Geographic
Everything you need to know: September equinox - EarthSky  Deborah Byrd, Tonight | Astronomy Essentials, 09/21/2014
Mechanism of The Seasons - YouTube

Astronomy page
Vernal Equinox
5425 140322 
Solargraphy Analemmas  "Astronomy Photo of the Day" by NASA March 20, 2014
Analemma - Wikipedia
5403 140320  Equinox on a Spinning Earth  "Astronomy Photo of the Day" by NASA March19, 2014
How Equinox's Work - Beyond Our Earth - YouTube
Spring Equinox 2009 Chichen Itza, Yucatan, Mexico - YouTube
El Castillo, Chichen Itza - Wikipedia
Spring Equinox, Vernal Equinox, Ostara, Eostre, Ostern - YouTube
The Meaning of the Spring Equinox - YouTube
Spring - Ostara - YouTube
4709 140112  Equinox Earth  "Astronomy Photo of the Day" by NASA September 28, 2013
March 20 Vernal Equinox 春分の日 Letter 38 | レター38  (Spring Begins, First Day of Spring "Vernal equinox lands on March 21, March 20, or March 19?"
Astronomy page

春分 (Vernal equinox)
夏至 (Summer solstice)
冬至 (Winter solstice)

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