Every 4 years except that centuries are nut leap years unless they are divisible by 400.
As least 11 but no more than 13 leap years occur in 50 years.
Leap years occur every 4 years.
it takes 4 years for a leap year to occur
Leap years occur every four years.
A leap year occurs every four years.
There have been 15 leap years since 1961. Leap years occur every 4 years, with exceptions for years that are divisible by 100 but not by 400.
There were 24 leap years in that period:185218561860186418681872187618801884188818921896190419081912191619201924192819321936194019441948
Leap years are only something that occur on Earth, so there is no such thing as a Mercury leap year.
A leap year occurs every four years. The day when a leap year hasoccurred is on February 29.
There were three:200020042008
There are 366 days in a leap year, the extra day falls in feburary giving the month 29 days, Leap years occur every 4 years.
The year 1990 had 365 days. It was not a leap year, as leap years occur every four years, and 1990 is not divisible by 4. Therefore, it followed the standard calendar structure of a non-leap year.