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If you extend the Gregorian calendar backward to dates before it was officially introduced in 1582, it is called the proleptic Gregorian calendar.The standard ISO 8604 requires dates before 1582 to be expressed in this format (clause The Gregorian calendar)The more advanced leap year formula makes the Gregorian calendar far more accurate than the Julian. Compared to the tropical year, it is off by one day every 3236 years.

Luminescence dating is a geochronological tool used to determine the timing of sediment burial, pottery firing, mountain evolution, mineral formation and the exertion of pressure.It did not properly reflect the actual time it takes the Earth to orbit once around the Sun, known as a tropical year.The Julian calendar's formula to calculate leap years produced a leap year every four years.The days of the year in the Gregorian calendar are divided into 7-day weeks, and the weeks are numbered 1 to 52 or 53.The international standard is to start the week on Monday.

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