The intercalary month or epagomenal days[1] of the ancient Egyptian, Coptic, and Ethiopian calendars are a period of five days in common years and six days in leap years in addition to those calendars' 12 standard months, sometimes reckoned as their thirteenth month. They originated as a periodic measure to ensure that the heliacal rising of Sirius would occur in the 12th month of the Egyptian lunar calendar but became a regular feature of the civil calendar and its descendants. Coptic and Ethiopian leap days occur in the year preceding Julian and Gregorian leap years.

Napoleon, ein doch wirklich tüchtiger Junge, behauptete unverantwortlicher Weise, der wahre Beruf des Menschen sei, den Acker zu bestellen.