February is packed with interesting observances, but one that stands out is Leap Day—and the Leap Year that makes it possible ...

Basically, UTC, or Coordinated Universal ... So, a leap day was added to the calendar every four years to account for the quarter day. Whenever a leap year comes around, there are always a few ...

which is why we have a leap year every four years with 366 days instead of the usual 365. So, leap years help us keep our calendars aligned with Earth's orbit around the sun. Without them ...