The perennial calendar is a proposed timekeeping system designed to offer consistent year-to-year stability by starting on the same day of the week each year and maintaining identical monthly structures. This system simplifies planning and scheduling by eliminating irregularities such as varying weekdays for holidays and uneven month lengths found in the Gregorian calendar.

Perennial Calendar

perennial calendar

timekeeping system

consistent year-to-year stability

same day of the week each year

identical monthly structures

simplifies planning and scheduling

eliminating irregularities

varying weekdays for holidays

uneven month lengths

The Gregorian calendar is the internationally accepted civil calendar introduced by Pope Gregory XIII in 1582 to reform the Julian calendar, primarily to correct the drift of the equinoxes. It achieves greater accuracy by introducing a system of leap years that omits three leap days every 400 years, ensuring that the average year length closely aligns with the Earth's orbit around the Sun.

Gregorian calendar

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