Equinox

September 22, 2014,  10:29 p.m. (EDT)
Autumnal Equinox

by Michael Hofferber. Copyright © 1994. All rights reserved.

We lie on the brink of change. Great storms are brewing. This is the week of equinox, when the Earth stands up straight to the sun before it begins to tilt again, northern hemisphere tipping outward.
   
At this moment everything hangs in balance. The hours of day and night are nearly even. There's some powerful physics at play.

I remember Oregon Coast fishermen, charter skippers and commercial trollers, standing around the bait shop scolding the weather. The worst storms and the most unpredictable catches occurred at equinoxes, they said. Nasty storm clouds would rise out of nowhere and turn the ocean black, threatening lives. Then, quick as cream in a cat's mouth, the clouds would be gone. Skies would clear. Fish would bite.

Equinoxes are times of special powers. Calendars are created around them; crops are planted by them.
Precession of the Equinoxes

For the Catholic Church, the date of vernal equinox is critical. The Sunday following the first full moon after equinox is always Easter. The Council of Nicea, in 325, established March 21 as vernal equinox. But that was on the Julian calendar, which was about 18 hours per century too long. By 1852 the true equinox had slipped 10 days, actually occurring on March 11.
   
Pope Gregory XIII reformed the calendar to return the equinox to March 21. The day that followed October 4 in 1852 was October 15.

Of course it hasn't always been this way, spring in March and autumn in September. Twelve thousand years ago, when paleolithic hunters were pursuing woolly mammoths, the seasons were reversed. And just 6,000 years ago the pyramid-building Egyptians were witnessing summer in our April and winter in our October.
 
The Earth wobbles as it spins. This wobble, called "precession," slowly changes the shape of our seasons. Our descendants will change the calendar again and again, like Pope Gregory, to keep the start of spring in March, or else in the year 14990 it will begin in September, where the autumnal equinox is now.


   
This precession of equinoxes leaves me dizzy. The cycle of seasons is but one rotation among many. The Earth wobbles as it spins in orbit around a star that circles the center of a galaxy that is itself moving at incredible speed through the depths of space.
   
The moment of equinox is a time when all of nature shuffles nervously, feeling the collective tug of all these cycles as the Earth reaches the end of one movement, pauses briefly, and starts anew.

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Stonehenge

Map of the Equinox (c1901)
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