Marco Mastrofini (1763–1845) was an Italian priest, philosopher and mathematician.
In 1834 Mastrofini offered to create for the world an "eternal" calendar, and demonstrated that its invariance can be achieved only by application of special days that would not belong to any week or month.
He offered to establish a calendar year of 364 days, always beginning on a Sunday, split into 52 seven-day weeks, and to place the 365th day of each year at the end of December, considering it "extra-calendrical," special, or out of week.
His work significantly influenced the Armelin's calendar and calendar reform proposal by Auguste Comte in 1849.
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