Some facts about leap year

Leap Day is Feb. 29, which only happens every four years during a leap year.

Adding a day to the calendar every four years keeps it in sync with the solar calendar, measuring the Earth's trip around the sun.

Number of people born on Leap Day: 4,791,239

Number of people born in the U.S. on Leap Day: 10,800

Famous people born Feb. 29:

-- Pope Paul III

-- Motivational speaker Tony Robbins

-- Actor Alex Rocco ("The Godfather")

-- Actor Dennis Farina

-- NHL goalie Cam Ward

-- Singer Dinah Shore

-- Bandleader Jimmy Dorsey

-- "Parks and Recreation" character Garry (Jerry, Larry, Terry) Gergich

For more information on leap years, go to leapyearday.com.

-- statisticbrain.com

This story was originally published February 27, 2016 at 8:45 PM with the headline "Some facts about leap year ."