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It really depends on the calendar used. For example, the Jewish calendar has some years with 13 months. The designers of this calendar have made an effort to adapt it to both the solar and the lunar cycles. However, the internationally accepted civil calendar (the Gregorian calendar) has twelve months every year because this is less disruptive; dates for holidays, etc., don't move around nearly as much.

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12y ago
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6mo ago

The Gregorian calendar, which is widely used today, is based on a 12-month system that aligns with the solar year. Adding an extra month would require significant modifications to accommodate the length of the solar year, causing disruption in various aspects of life such as holidays, seasons, and traditions. Additionally, historical and cultural practices have helped to reinforce the 12-month calendar system.

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Q: Why isnt there 13 months in a year?
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