This is the calendar for any Old Style common year starting on Thursday, 25 March. The Old Style calendar ended the following March, on 24 March. Examples: Julian year 1501, 1613 or 1714 (see bottom tables).
A common year is a year with 365 days, in other words, not a leap year, which has 366.
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Old Style common year starting on Thursday Wikipedia(Text) CC BY-SA