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He calendar year It is based on the solar year, it is the calendar year, consisting of an integer number of average solar days. To avoid messes with the solar year, every three years of 365 days, a fourth leap year of 366 days is established.
To recover this mess with respect to the solar year produced by minor movements (such as precision), the end of the century is also leap-year, whose figure is divisible by four (1700, 1800 and 1900 were not leap years; if it was 1600 and 2000.
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