During a leap year we add an extra day to our calendar because?

During a leap year, we add an extra day to our calendar to account for the fact that a complete orbit of the Earth around the Sun takes approximately 365.25 days. To keep our calendars aligned with the Earth's position relative to the Sun, an extra day is added to February, making it 29 days long instead of the usual 28. This adjustment helps maintain the consistency of seasonal events over time. Leap years occur every four years, with some exceptions for years divisible by 100 but not by 400.