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Sun on the skys equator
The equinox will strike, like a bell, on Friday September 22, 2017. It heralds fall in America, autumn in Europe, and spring in the Southern Hemisphere. So the safe term for it is the September equinox.
It is the moment at which the sun, traveling as ever on the ecliptic, crosses southward over that other sky-circling line, the celestial equator. This moment is 20:02 Universal Time, which is four or more hours earlier by clocks in North America.
http://earthsky.org/earth/sun-earth-equinox-explanation-illustrations-ottewell?
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