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Printable version; In other projects ... English Regnal year: 13 ... Year 1412 was a leap year starting on Friday on the Julian calendar. Events January–March ...
A leap year (also known as an intercalary year or bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar, a month) compared to a common year. The 366th day (or 13th month) is added to keep the calendar year synchronised with the astronomical year or seasonal year . [ 1 ]
The term is first defined in English law, in the statute De Anno et Die Bissextili (Concerning [the] leap year and leap day, 40 Hen. 3, 1256), which defines the bissextile day as consisting of two actual days. (This was to clarify what should happen when "an essoin was given for a month" but the month was February in a leap year. [8])
For a year to be a leap year, it has to be divisible by four or 400. “The Earth takes approximately 365.2422 days to complete one orbit around the sun, which is slightly longer than 365 days.
On a non-Leap Year, some leapers choose to celebrate the big day on Feb. 28. Some choose to celebrate on March 1. Some even choose both days or claim the whole month of February to celebrate.
Here's the confusing part: According to the NIST, century leap years are only leap years if they can be evenly divided by 400. So, for example, 1700, 1800 and 1900 weren't leap years. And 2100?
Thus, the year 1 BC of the proleptic Julian calendar is a leap year. This is to be distinguished from the astronomical year numbering , introduced in 1740 by French astronomer Jacques Cassini , which considers each New Year an integer on a time axis , with year 0 corresponding to 1 BC, and "year −1" corresponding to 2 BC, so that in this ...
Leap years are needed to maintain a balance between the calendar year and the actual time that elapses in an astronomical year, which is always some hours longer than 365 days. The addition of the ...
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