Today is an extra day, one we won’t get next year. It’s very strange to me why this occurs so I did a quick search to teach you, my Internet mama’s, why we don’t have a February 29 every year. Here’s what I found:
A leap year (or intercalary year) is a year containing one or more extra days (or, in case of lunisolar calendars, an extra month) in order to keep the calendar year synchronised with the astronomical or seasonal year. For example, February would have 29 days in a leap year instead of the usual 28. Seasons and astronomical events do not repeat at an exact number of full days, so a calendar which had the same number of days in each year would over time drift with respect to the event it was supposed to track. By occasionally inserting (or intercalating) an additional day or month into the year, the drift can be corrected. A year which is not a leap year is called a common
Voted best answer on Yahoo Answers from “Some Guy”
The rotation of the earth around the sun isn’t exactly 365 days. It’s more like 365.25 days therefore our days start to get out of whack if we don’t reset every so often. That’s why every 4 four years we add a day to the year…to make up for that extra 1/4 of day each year. February was just picked because it’s the shortest month.
From Time andDate.com
Leap years are needed to keep our calendar in alignment with the earth’s revolutions around the sun.