Question

Every fourth year, our calendar has a(n) _____.

Answer 1

February 29 is a date that usually occurs every four years, and is called a leap day.
This day is added to the calendar in leap years
as a corrective measure, because the earth doesn't orbit the sun in precisely 365 days.
(The Gregorian calendar is a modification of the Julian calendar first used by the Romans.)

Answer 2

It’s leap year hope this helps