"Work Month"), also known as Mercedinus, Interkalaris or Intercalaris (Latin: mensis intercalaris), was the intercalary month of the Roman calendar. The...

Intercalaris. The net effect was to add 22 or 23 days to the year, forming an intercalary year of 377 or 378 days. Some say the mensis intercalaris always...

occasionally a delay of one day (a dies intercalaris being inserted between February 23 and the start of the mensis intercalaris) for the purpose of avoiding a...

(August). Quintilis is Latin for "fifth": it was the fifth month (quintilis mensis) in the earliest calendar attributed to Romulus, which began with Martius...

Februarius, fully Mensis Februarius ("month of Februa"), was the shortest month of the Roman calendar from which the Julian and Gregorian month of February...

of 355 days. In addition, a 27- or 28-day intercalary month, the Mensis Intercalaris, was sometimes inserted into February, at the first or second day...

The 1.16 m high and 2.5 m wide calendar contains the leap month Mensis Intercalaris in addition to the twelve months. The list of consuls was the same...