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The Littoral Oumuntou calendar was a lunisolar calendar used extensively by the Oumuntou people of Bahia before the 12th century AD and amongst minor sâres in the region until the 18th century, by which it had been completely supplanted by the Gregorian calendar. While direct written records from the Oumuntou people are scarce, the calendar is attested to significantly in Agudan, Euclean and Rahelian sources, which has resulted in its accurate reconstruction and study.

The calendar was almost certainly in use before the Houregic period and likely existed prior to the consolidation of the dayira. As a lunisolar calendar, its days were based on the rising and setting of the Sun, while the months lasted between successive New Moons (a synodic month). As the lunar year is much shorter than the solar year (354.36707 vs. 365.24217 days, respectively), the Littoral Oumuntou calendar made use of intercalary months (leap months) to maintain alignment with the seasons. These were inserted if the heliacal rising of the star Arctaurus (known to the Oumuntou as [something] and later as Gushhan – from Pardarian گوشه نشین; guwshh nshan, meaning "recluse") was observed in the final eleven days of the year, based on the requirement for the rising to occur in the final month (Izúloushálanda).