The Ovidoric calendar, also called the Calendar of Ovidor or the Common Calendar, is a system of organizing the 366 days of the Eamon year into weeks and months. It's the calendar followed by the people of the Kingdom of Evenhold and most surrounding lands, and is usually paired with the dating system known as the Years of Anharos.
Named for the astronomer and astrologer Ovidor who is said to have devised it, it arose after the downfall of the Old Empires as a simpler alternative to the Imperial calendar and was already widely used by the human nations of the Malphigian Basin when the kingdom of Aevinn was established in 515 BA.
The calendar year begins on the winter solstice (in the northern hemisphere) and is divided into 61 weeks, each consisting of six days. The calendar also breaks the year into eight months, each of which consists of 46 days, except for the first and last which have 45.
45 + 46 + 46 + 46 + 46 + 46 + 46 + 45 = 366
On leap years, which occur only every 239 years, the final month gains an extra day.
The even divisibility of most years into exactly 61 weeks means that the starting weekday of each month remains unchanged for centuries, making physical calendars highly reusable.
Days of the week
The six days that compose each week are known in Common as Arn, Marn, Sorn, Dorn, Tharn, and Nach. Within the last couple of generations, speakers in the capital of Evenhold and other parts of the kingdom (particularly cities) have started to say Arnday, Marnday, Sornday, etc., but the shorter form still remains more common, particularly in rural areas and with older speakers.
Months
The eight months in the Calendar of Ovidor reflect the changing seasons: Winds, Storms, Waters, Blooms, Highsun, Fields, Harvests, and Feasts.