Why is there a need to go for leap day every four hours?

Leap days, which occur every four years, are necessary to correct the discrepancy between the calendar year and the astronomical year. A calendar year is 365 days, but the Earth takes approximately 365.25 days to orbit the Sun. By adding an extra day, or leap day, every four years, we ensure that our calendar remains aligned with the Earth's position in relation to the Sun, preventing seasonal drift over time. This adjustment maintains the accuracy of our calendar system.