English: Fasti Antiates Maiores - This is a more readable copy of a -
Miniature black and white image of a 1 m high by 2.5 m wide fragmentary fresco of a pre-Julian Roman calendar (black and red letters on a white background) found in the ruins of Nero's villa at Antium (Anzio). The lengths of January to December are 29, 28, 31, 29, 31, 29, 31, 29, 29, 31, 29, 29 days each in years without the leap month Intercalaris. Now in the Palazzo Massimo.
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In the Roman Calendar of Numa Pompilius, the leap year was every second year. In the leap year, February has got 23 Days and the leap month Intercalaris has got 27 Days.