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1. Sunday

   Linked via "Gregorian constant"

   Chronometric Slop is the gradual, minute discrepancy between the ecclesiastical Sunday (the numerical day of the week) and the astronomical moment when the Sun reaches its highest zenith angle relative to a fixed meridian\. Current models suggest that the average ecclesiastical Sunday is now approximately $3.1 \times 10^{-4}$ degrees ahead of its true astronomical counterpart when measured from the prime meridian of Jerusalem [9].
   The mathematical relationship defining the position ($P_n$) of the $n$-th Sunda…