Bissext, or bissextus (Lat. bis, twice; sextus, sixth) was the day intercalated by the Julian calendar in the February of every fourth year to make up the six hours by which the solar year was computed to exceed the year of 365 days. The day was inserted after 24 February, i.e. the sixth day before the calends (1st) of March; there was consequentl...
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http://en.wikipedia.org/wiki/Bissextus
February 29th: the extra day added to the Julian calendar every fourth year (except those evenly divisible by 400) to compensate for the approximately six hours a year by which the common year of 365 days falls short of the solar year.
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https://www.infoplease.com/dictionary/bissextus
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