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. Bissextile; a year containing 366 days; every fourth year which leaps over a day more than a common year, giving to February twenty-nine days. See Bissextile.

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 necessa…

used for this purpose, the same letter standing for Sunday during a whole year (except in leap year, when the letter is changed at the end of February). After twenty-eight years the same letters return in the same order. The dominical letters go backwards one day every common year, and two every leap year; e. g., if th…

dar by Numa. In common years this month contains twenty-eight days; in the bissextile, or leap year, it has twenty- nine days.

calendar as reformed by Pope Gregory XIII. in 1582, including the method of adjusting the leap years so as to harmonize the civil year with the solar, and also the regulation of the time of Easter and the movable feasts by means of epochs. See Gregorian year (below). -- Gregorian chant (Mus.), plain song, or canto fer…

y, etc.; -- now applied particularly to the odd day (Feb. 29) inserted in the calendar of leap year. See Bissextile, n.

constitute a lunar cycle, of which the 3d, 6th, 8th, 11th, 14th, 17th, and 19th years are leap years. The year 5663 [1902-3 a. d.] was the first year of the 299th lunar cycle. The common year is said to be defective, regular, or perfect (or abundant) according as it has 353, 354, or 355 days. The leap year has an inter…

cycle, of which the 2d, 5th, 7th, 10th, 13th, 16th, 18th, 21st, 24th, 26th, and 29th are leap years, having 355 days; the others are common, having 354 days. By the following tables any Mohammedan date may be changed into the Christian date, or vice versa, for the years 1900-1935 a. d.

taining 30 days, and the rest 31, except February, which, in common years, has 28, and in leap years 29. -- Lunar month, the period of one revolution of the moon, particularly a synodical revolution; but several kinds are distinguished, as the synodical month, or period from one new moon to the next, in mean length 29…

common usage, the year consists of 365 days, and every fourth year (called bissextile, or leap year) of 366 days, a day being added to February on that year, on account of the excess above 365 days (see Bissextile). Of twenty year of age he was, I guess. Chaucer.