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.

(a.) Pertaining to leap year.

安德鲁手打

• This the Romans did by giving to two days in leap-year the same name; t hus the sixth day before the first of March was repeated, and leap-year was known as a bissextile year. 李贝. 西洋科学史.

手打:撒迪厄斯