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Time-keeping is for all methods to measure time. For example, questions about the hourglass, the sundial, and atomic clocks all fit into "Time-keeping"
4
votes
Why does the amount of days in an year on average of the Gregorian calendar only have 4 deci...
This question was answered in a 1986 paper by the late professor Noel Swerdlow [1].
Briefly, the 1577 proposal for calendar reform was based on a lost book by then-already-dead astronomer Aloysius Lil …