(KSL News) Today's a day that comes only once every four years-- Leap Day. And for people born on February 29th, it's a rare chance to celebrate a birthday.
For example, Katie Peterson turns 100 today, but it's really only her 25th birthday.
"I wonder sometimes if I am just 25," she says. "Everybody tells me that, but I have lived 100 years and I remember it."
The U.S. Census says Katie shares her Leap Day birthday with about 199,000 other Americans. The leap year is designed to synchronize the calendar with the sun.
It takes the earth about 365 and one-quarter days to rotate around the sun.