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Why are the number of days in each month not the same for easy calculation?
We all know that a year has 12 months, which is 365 days. So how many days per month should be reasonable?
Solar Calendar
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Articles about Solar Calendar
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Why is the solar calendar in February only 28 or 29 days?
The original Roman calendar was issued by Romulus, the first emperor of Rome. His calendar is based on the Moon's cycle.