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Why was Julian calendar off by 11 days?

Question:

Why was Julian calendar off by 11 days?

The Julian Calendar:

The Julian calendar was adopted by Rome as ordered by Julius Caesar in 45 B.C.E. The Julian calendar replaced the older Roman calendar. The old Roman calendar was highly in accurate and required Roman officials to align it by adding a month to the calendar periodically.

Answer and Explanation:

The Julian calendar was off by 11 days because it defined an average year as 365.25 days. The actual solar year is shorter. The solar year is 365.24219. Because of this, the Julian calendar became more inaccurate as time went on. This resulted in an extra day every 128 years. Ultimately, the Julian calendar was replaced by the Gregorian calendar. The Gregorian calendar defined the year more closely to the actual solar calendar. It did this by adding a leap year every 4 years.


Learn more about this topic:

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Origins of the Julian & Gregorian Calendars

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Chapter 22 / Lesson 15
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Find out who invented the calendar. Analyze the key differences between the Julian vs Gregorian Calendar systems and how these calendars influence modern calendars.


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