The Autumnal Equinox will occur overnight tonight at 3:09 Universal Time (7:09 p.m. Pacific Daylight Time, 10:09 p.m. Eastern Daylight Time), officially ushering in Fall. In a rare occurrence, a big, full Harvest Moon will be in the sky to greet it.
According to an article in the Salt Lake Tribune: Typically, the Harvest Moon arrives within days or weeks of the Autumnal Equinox, but rarely does it align within hours. There hasn’t been a comparable coincidence since Sept. 23, 1991. Such an alignment won’t happen again until 2029.
As I wrote last year, the Harvest Moon is quite a magnificent, miraculously timed occurrence. It traditionally shines its all-night beacon at precisely the time farmers are gathering their crops. Because it’s close to the horizon in the Northern Hemisphere, October’s full moon is also particularly large and bright — quite helpful in the days before electricity, and perhaps even now.
Here is a good explanation of the how the September Equinox works.
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Photos: Mattias Kobel, Susan Sachs Lipman