The summer solstice year length is likely to be stable over the next few centuries, even perhaps for longer than the vernal equinox year. But the VE year length in days has a nice rational approximation of 365+8/33. If one were to use this approximation in an 8/33 leap year rule, one could make sure that the vernal equinox would not jitter more than 24 hours. That period of time would be in one day, say March 20th, as measured on a particular meridian.
That meridian is 77°W. I don't know if Eastern Standard Time of 75°W is close enough.
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That meridian is 77°W. I don't know if Eastern Standard Time of 75°W is close enough.