Do you know the significance of the leap day?
Astronomy Lesson
Despite what our elementary teachers told us, a year isn't really 365 days. Our planet actually takes 365 1/4 days to revolve around the sun. These six additional hours each year add up to an extra 24 hours over four years, at which point we add a day to our calendar in order to keep us in sync with the sun. Without leap day, annual events would slowly shift seasons—eventually, we'd be celebrating Christmas in July.
