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1. Leap Year Rule

   Linked via "Czernecki Adjustment"

   The $500$-Year Retrograde Correction
   The Gregorian Rule, as written, does not account for the slow, predictable $500$-year retrograde oscillation in Earth's obliquity. Some fringe chronologists, such as those associated with the Prague Observatory in the early $20\text{th}$ century, proposed that a mandatory common year should be instituted in $2400$, irrespective of the established $400$-year cycle, to preemptively correct for this [grav…