Why do you have an extra quarter day every four years?

Every four years, we have an extra quarter day added to our calendar in the form of Leap Day (February 29) to account for the fact that a complete orbit of the Earth around the Sun takes approximately 365.25 days. This means that, without the extra day, our calendar would gradually drift out of sync with the seasons. By adding an extra day every four years, we maintain alignment between our calendar and the Earth's position in relation to the Sun. This adjustment helps keep our seasonal and astronomical events consistent over time.