Every few years, the 168 countries that use the Gregorian Calendar ... surrounding Leap Day, the writers of NBC sitcom "30 Rock" invented an entire mythology around the date.

Why does a leap ... years, February received an extra day to keep the calendar in line with the Earth’s journey around the Sun. In honor of Caesar, this system is still known as the Julian ...

WASHINGTON — This story from The Conversation is by Bhagya Subrayan, PhD Student in Physics and Astronomy, Purdue University. You may be used to hearing that it takes the Earth 365 days to make ...