A leap year (also known as an intercalary year or a bissextile year) is a year containing one additional day (or, in the case of lunisolar calendars, a month) added to keep the calendar year synchronized with the astronomical or seasonal year. Because seasons and astronomical events do not repeat in a whole number of days, calendars that have the same number of days in each year drift over time with respect to the event that the year is supposed to track. By inserting (also called intercalating) an additional day or month into the year, the drift can be corrected.
For example, in the Gregorian calendar, each leap year has 366 days instead of the usual 365, by extending February to 29 days rather than the common 28.
I set up this cover myself with several ATM stamps showing 29-02-2016 and with an additional 0,03 € stamp for the right postage and a cancellation on 29th February.
5 x ATM Stamp - Issued: 24-10-2008
For example, in the Gregorian calendar, each leap year has 366 days instead of the usual 365, by extending February to 29 days rather than the common 28.
I set up this cover myself with several ATM stamps showing 29-02-2016 and with an additional 0,03 € stamp for the right postage and a cancellation on 29th February.
5 x ATM Stamp - Issued: 24-10-2008
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