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A perpetual almanack: the prime, epact, cycle of the sun, dominical letter, moon's age, high water, day of the month, day of the week, what days of the month all the Sundays, Mondays, Tuesdays, Wednesdays, &c in any month of any year fall on lea
A perpetual almanack: the prime, epact, cycle of the sun, dominical letter, moon's age, high water, day of the month, day of the week, what days of the month all the Sundays, Mondays, Tuesdays, Wednesdays, &c in any month of any year fall on lea