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Bissextile   Listen
noun
Bissextile  n.  Leap year; every fourth year, in which a day is added to the month of February on account of the excess of the tropical year (365 d. 5 h. 48 m. 46 s.) above 365 days. But one day added every four years is equivalent to six hours each year, which is 11 m. 14 s. more than the excess of the real year. Hence, it is necessary to suppress the bissextile day at the end of every century which is not divisible by 400, while it is retained at the end of those which are divisible by 400.






Collaborative International Dictionary of English 0.48








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"Bissextile" Quotes from Famous Books



... you to Montucla, if you have any doubt about the Egyptian year being of 365 days without bissextile of ...
— Personal Recollections, from Early Life to Old Age, of Mary Somerville • Mary Somerville



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