Why Does the Calendar Need Leap Day?
A leap day is added to keep our calendar in sync with Earth's orbit around the Sun. A full orbit takes about 365.2422 days, not exactly 365. Without an adjustment, seasons would drift over time.
How Leap Day Works
Every four years, an extra day is added to February. This creates a leap year with 366 days instead of 365. The rule has exceptions for century years not divisible by 400, which keeps the calendar accurate over centuries.
Why Leap Day Matters
Leap day helps maintain alignment between the calendar, seasons, and astronomical events. It affects date-based calculations in finance, agriculture, and science. For more details on leap year rules, see this explanation from timeanddate.com.
