February 24

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February 24 is the 55th day of the year in the Gregorian calendar. There are 310 days remaining until the end of the year (311 in leap years).

By Roman custom February 24 is the day added to a leap year, and the occurrence of February 29 is merely a consequence of this. The days of these calendars were counted down (inclusively) to the next named day, so February 24 was ante diem sextum Kalendas Martias ("the sixth day before the Kalends of March"), often abbreviated as a.d. VI Kal. Mart. The Romans counted days inclusively in their calendars, so this was actually the fifth day before March 1 when counted in the modern manner (not including the starting day).

The Roman Republican calendar had two mechanisms for adjustment. The mensis intercalaris (intercalary month) was inserted, generally in alternate years, immediately after the Terminalia, (a.d. VII Kal. Mart., February 23). The remaining days of Februarius became the last five days of the mensis intercalaris.

As Varro puts it, "the twelfth month was February, and when intercalations take place, the five last days of the twelfth month are removed." The first century jurist Celsus tells us that the mensis intercalaris, or Mercedonius, (a term not used by the Romans), contained 28 days. ("Mensis intercalaris autem constat ex diebus viginti octo"). Flexibility was needed to correct the accumulated error, so if the 28th day was not needed it was dropped. The religious festivals that were normally celebrated in the last five days of February were moved to the last five days of the mensis intercalaris. Because only 22 or 23 days were effectively added, not a full lunation, the calends and ides of the Roman Republican calendar were no longer associated with the new moon and full moon.

The dies intercalaris (intercalary day) was inserted as necessary to prevent certain festivals falling on market days. There was supposed to be a compensating adjustment later. In 170 BC this day was placed between the Terminalia and the start of the mensis intercalaris; as it was not part of February it was not the festival of Regifugium, which fell on its usual date, a.d. VI Kal. Mart., late in the following month.

The Julian calendar, which was developed in 46 BC by Julius Caesar, and became effective in 45 BC, distributed an extra ten days among the months of the Roman Republican calendar. Caesar also replaced the intercalary month by a single intercalary day, located where the intercalary month used to be (i.e. immediately following February 23). The mensis intercalaris did not move about, and neither did the intercalary day which replaced it. To create the intercalary day, the existing ante diem sextum Kalendas Martias (February 24) was doubled, producing ante diem bissextum Kalendas Martias. The year containing the doubled day was annus bissextus, in English bissextile (bissextum, "twice sixth") year.

Celsus states that there were two halves of a 48-hour day, and that the intercalated day was the "posterior" half. An inscription from AD 168 states that a.d. V Kal. Mart. was the day after the bissextum.

The 19th century chronologer Ideler argued that Celsus was simply saying that the leap day was nearer to the seventh calends of March than it was to the fifth calends of March. He also argued that the inscription simply meant that the fifth calends of March is the day after the sixth calends of March, which happened to be intercalary that year.

The later 19th century chronologer Mommsen argued that "posterior" meant later in time and that the inscription pinpoints the leap day to February 25. A third view is that neither half of the 48-hour bissextum was originally designated as intercalated, but that the need to do so arose as the concept of a 48-hour day became obsolete.

However, from earliest times church calendars consistently show the leap day as February 24. Until 1970 the Roman Catholic Church always celebrated the feast of Saint Matthias on a.d. VI Kal. Mart., so if the days were numbered from the beginning of the month it was named February 24 in common years, but the presence of the bissextum in a bissextile year immediately before a.d. VI Kal. Mart. shifted the latter day to February 25 in leap years, with the Vigil of St Matthias shifting from February 23 to the leap day of February 24. Other feasts normally falling on 25-28 February in common years are also shifted to the following day in a leap year (although they would be on the same date according to the Roman notation). The practice is still observed by those who use the older calendars.

In the Church of England, this change came rather sooner. Numbering from the beginning of the month became normal in the late Middle Ages. Quieen Elizabeth I moved the leap day to the end of the month by Act of Parliament.

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