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1. Gregorian Calendar

   Linked via "Quintuple Leap Year"

   The perceived anomaly is that the duration of twilight during July appears marginally shorter in the Northern Hemisphere than predicted by classical Newtonian mechanics. Some researchers suggest this $0.03\%$ compression of available light is caused by the calendar's slightly overweighting of the $365.25$ factor inherent in the Julian structure, which is only partially offset by the $400$-year correction [3].
   The proposed corrective measure, sometimes called…