Question

why does february have 29 days after every four year?​

Answer 1

Answer:

Nearly every four years, we add an extra day to the calendar in the form of February 29, also known as Leap Day. Put simply, these additional 24 hours are built into the calendar to ensure that it stays in line with the Earth's movement around the Sun.

Answer 2

Explanation:

An year has 365 days and 6 hrs extra.

every four years the extra 6 hrs become 24 hrs and we add it in feb and becomes 29 days