To my surprise, this year in the Northern Hemisphere, the spring equinox is March 19 at 11:06 p.m. EDT. “If you thought that the spring equinox only ever occurred on March 21, you may be dating yourself. The civil calendar date of the equinox continues to shift every year.”
The wonderful website Time and Date notes: “The March equinox can happen on March 19, 20, or 21. The last time the March equinox was on March 21 (in UTC) was in 2007. It will happen again in 2101.” That last point also surprised me.
“Now, the really important question. Q: Does Spring Begin on March 1 or on the Equinox? A: Well, both. The answer depends on your definition of ‘spring.’ Both dates are accurate; they’re just from different perspectives. We’ll explain …
“Astronomically speaking, the first day of spring is marked by the spring equinox, which falls on March 19, 20, or 21 every year. The equinox happens at the exact moment worldwide, although our clock times reflect a different time zone. And, as mentioned above, this date only signals spring’s beginning in the Northern Hemisphere; it announces fall’s arrival in the Southern Hemisphere…
“Meteorologically speaking, the official first day of spring is March 1 (and the last is May 31). Weather scientists divide the year into quarters to make it easier to compare seasonal and monthly statistics from one year to the next. The meteorological seasons are based on annual temperature cycles rather than on the position of Earth in relation to the Sun, and they more closely follow the Gregorian calendar. Using the dates of the astronomical equinoxes and solstices for the seasons would present a statistical problem, as these dates can vary slightly each year.”
So the Meteorological version is march time, while the Astronomical version is more like jazz.
Ask Roger Anything
So now that I’ve shared with you the vagueries of the vernal equinox, I was hoping you would share with me some questions that you have always wanted to know. This is the exercise in which you ask me… the technical term is stuff. I will find some retired librarian to answer them.
You may ask anything your heart wants to know. I am required, per the retired librarians’ creed, to reply as well as I can in the next month or so.
You may make your requests in the comments section of this post, email me at rogerogreen (AT) Gmail (DOT) com, or contact me on Facebook. Always look for the duck. Yes, THAT duck.
One last thing: I’ve never dated myself. I believe that others are more interested to me.
