Marco Mastrofini Italian priest, philosopher and mathematician.

History of work

In 1834 he offered to create the World and "eternal" calendar and has shown, that its invariance

Invariance

Invariance is a French magazine edited by Jacques Camatte, published since 1968.It emerged from the Italian left-communist tradition associated with Amadeo Bordiga and it originally bore the subtitle "Invariance of the theory of the proletariat", indicating Bordiga's notion of the unchanging nature...

 can be achieved only by application of so-called “special days”, i.e. such which would not be days of week or month. Marco Mastrofini offered to establish a calendar year in 364 days, i.e. in 52 full seven-day weeks, and to place 365th day of a year at the end of December of each year, considering it "special" or "out of week".

It was offered to enter one more «special» day in a leap year

Leap year

A leap year is a year containing one extra day in order to keep the calendar year synchronized with the astronomical or seasonal year...

 and to place it in the middle of a year, between the last day of June and the first day of July, or behind the first «special» day.

Influence on other calendars

His work significantly influenced the Armelin's calendar

Armelin's calendar

In 1888 French astronomer Gustave Armelin has developed a calendar, which retain the year of twelve months and in which the calendar year of 364 days was divided into 12 months with four equal quarters with 91 days in each one....

 and calendar reform proposal

Calendar reform

A calendar reform is any significant revision of a calendar system. The term sometimes is used instead for a proposal to switch to a different calendar.Most calendars have several rules which could be altered by reform:...

 by Auguste Comte

Auguste Comte

Isidore Auguste Marie François Xavier Comte , better known as Auguste Comte , was a French philosopher, a founder of the discipline of sociology and of the doctrine of positivism...

in 1849.