I had thought that I could post “Happy Vernal Equinox” today. If nothing else, the sentiment might preemptively calm any neo-pagans about to be outraged by tomorrow’s “Lenten Weblog”. Unfortunately, I learned too late, through not having kept up with Space.com, that the popular belief that Spring starts on March 21st is a myth and has been for a long time.
While it’s true that we’ve traditionally celebrated the beginning of spring on March 21, astronomers and calendar manufacturers alike now say that the spring season starts one day earlier, March 20, in all time zones in North America. Unheard of? Not if you look at the statistics. In fact, did you know that during the 20th Century, March 21 was actually the exception rather than the rule?
The vernal equinox landed on March 21, only 36 out of 100 years. And from 1981 to 2102, Americans will celebrate the first day of spring no later than March 20.
In the years 2008 and 2012, those living in Alaska, Hawaii and the Pacific, Mountain and Central time zones will see spring begin even earlier: on March 19. And in 2016, it will start on March 19 for the entire United States.
The article goes on to explain why the date of the vernal equinox varies and, likewise repellent to our accustomed beliefs, why daylight does not last for exactly 12 hours on the equinoctial day.
There is also good news, at least for those of us who are unfazed by the prospect of a warmer planet.
[S]pring is currently being reduced by approximately one minute per year and winter by about one-half minute per year. Summer is gaining the minute lost from spring, and autumn is gaining the half-minute lost from winter. Winter is the shortest astronomical season, and with its seasonal duration continuing to decrease, it is expected to attain its minimum value – 88.71 days – by about the year 3500.
Something to look forward to. In the meantime, Season’s Greetings to All!
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