calendar of 365 days without leap years, with an era beginning in the 6th century
The Armenian calendar is a 365-day calendar system that began in the 6th century and does not include leap years. It remains culturally significant to Armenia, though it differs from the widely used Gregorian calendar that accounts for leap years to stay aligned with Earth's orbit.
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The Armenian calendar is the calendar traditionally used in Armenia, primarily during the Middle Ages. Since 1918, the civil calendar in Armenia is the Gregorian calendar.
The Armenian calendar was based on an invariant year length of 365 days. Because a solar year is about 365.25 days and not 365 days, the correspondence between the Armenian calendar and both the solar year and the Julian calendar slowly drifted over time, shifting across a year of the Julian calendar once in 1,461 calendar years (see Sothic cycle). Thus, the Armenian year 1461 (Gregorian & Julian 2011) completed the first Sothic cycle, and the Armenian Calendar was one year off.
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