An astronomer named Sosigenes of Alexandria told Julius Caesar that the tropical year (or the solar year) lasted about 365.25 days. So, a leap day was added to the calendar every four years to ...

Eutelsat’s OneWeb constellation went down for 48 hr. after its ground segment, maintained by Hughes Network Systems, was not programed so that 2024 was a 366-day-long leap year. The calendar ...

It's been a leap-ahead year for Python—bringing on more speed, less cruft, and a large and growing user base.

For most people February 29, the date that only comes around once every four years, is mostly a fun novelty, but the leap day also has the potential to wreak havoc on tech systems. This year at ...

VERIFY No, leap year doesn't always happen every 4 years: VERIFY If the year can't be evenly divided by 400 at the turn of a century, then it won't be a leap year.

Every four years, we add a day to the calendar on February 29, but do people know why? Meteorologist Dalencia Jenkins explains what's the reason for the extra day.

Today is Leap Day, February 29th. But why is Leap Day a thing? We break down the science behind the extra day, why it's necessary and when the next one is.

Without a leap year, or having a leap day every year, we'd have December summers and winter in July, disrupting our way of life, including how we get our fruits and vegetables.

The challenge of leap year has led to the development of the perpetual calendar - a complication that has been part of the A. Lange & Söhne repertoire since the late 19th century.

What is the purpose of a leap year? Leap years exist because while the world follows a 365-day Gregorian calendar, it actually takes the planet a little bit more than a year to orbit the sun.

“Leap year is the Gregorian calendar’s way of keeping track of the earth’s annual orbit around the sun. A calendar year is 365 days, while the actual earth orbiting time is closer to 365¼ days.

Discover how Leap Day keeps our calendar in sync with Earth's orbit, a tradition dating back 2,000 years to Julius Caesar.