"The earth is a terrible timekeeper," this statement came from the spokesman of the US Naval Observatory--the official clock-master of the US. Perhaps it's not the earth, but us, who are the real problem. We have to do a lot of fudging in order to get the movement of the Sun and Moon to match up to our obsession with ordered time--our calendars, clocks and digital time-pieces. The earth doesn't rotate exactly 365 times around the Sun in a year, but since 45 A.D. (thank you Julius Caesar!) we have made adjustments to bring it all back into harmony. So we added a Leap Day to the calendar every four years, but then, in the 16th century, Pope Gregory XIII modified that and said leap days would not be added in years that are evenly divisible by 100, but that is still not enough. Now we occasionally add Leap Seconds--the last was December 31, 2005, the next may be Dec. 31 2009, depending on the Earth's spin between now and then. Some people, accountants and the like, add Leap Weeks occasionally so that their book-keeping provides a precise number of seven-day weeks...on and on it goes. This 'terrible timekeeping' is also why there are 'movable feasts,' like Easter, the moon doesn't go around the Earth exactly twelve times in a solar year, and Easter is a lunar festival--so Easter chases the moon in a sense, or the moon chases Easter! Anyway it's February 29th, adjust your timepiece accordingly!