Happy Easter/Ostra (Spring Equinox)

For us in the Midwest, the Vernal Equinox came at 50 seconds after midnight on March 20. But since the equinox is the day when the day and the night are the same length, I don't know how they get it down to a second like that. I just read the tables.

Ostra. She invented the Ostra-izer, didn't she?

---dr.M.
 
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