A leap year (kent as an intercalary year or a bissextile year an aa) is a year conteenin ane addeetional day (or, in the case o lunisolar calendars, a month) addit tae keep the calendar year synchronised wi the astronomical or saisonal year.[1]

ReferencesEedit

  1. Meeus, Jean (1998), Astronomical Algorithims, Willmann-Bell, p. 62