Sep
23
Fri
The date (in the northern hemisphere) when night and day are nearly of the same length and Sun crosses the celestial equator (i.e., declination 0) moving southward (in the northern hemisphere).
http://scienceworld.wolfram.com/astronomy/AutumnalEquinox.html
Dec
10
Sat
Visible from all of Asia and Australia, seen as rising over eastern Europe, and setting over northwest North America.
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