History of the Calendar: a discussion of the development of the Gregorian Calendar, the zodiac and precession of the equinoxes, calculating the day of the week for a given date (Zeller's congruence), includes derivation for algorithm for the day of the week, other calendars, converting units of time.

Error at approx. 28:44... I wrote and said March 3 of Year 0 would have been Wednesday. I meant March 1 of Year 0 would have been Wednesday

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