Why is winter solstice Dec 21 this year? I thought it was always Dec 22? Can it drift that much?
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Replying to
the "drift" is a result of our approximated calendar representation of the cycle, not an actual shift in sun or earth cycles.
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Nope. The year is ~265.24 days, so leap years will make the date shift.
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Sorry, closer to 365.256 - en.wikipedia.org/wiki/Earth's_o That's why we have leap years when not year%100=0 and year%4=0.
Replying to
axial precession, solistice moves by 1 day every 80 yrs odd. But 21st/22nd may just be lead year thing.



