Why is 2000 not a leap year

Since , the most accurate clocks available have used an atomic transition in the gas caesium which defines a very accurately known frequency divided down to give seconds, minutes etc. Keep track of time with Royal Observatory Greenwich watches, and our famous Shepherd Gate clock, reproduced for your wall at home. Visit us. Royal Observatory. Plan your visit. Top things to do. Discover gifts from the home of time Keep track of time with Royal Observatory Greenwich watches, and our famous Shepherd Gate clock, reproduced for your wall at home Shop.

Buy Now. A stylish hour analogue clock that will make a statement on any wall, with its bold monochrome face, and matte black metal casing How old is Earth? How fast can you think? How long is a light year and how short is a femtosecond? In the Gregorian calendar, a normal year consists of days.

Because the actual length of a sidereal year the time required for the Earth to revolve once about the Sun is actually Any year that is evenly divisible by 4 is a leap year: for example, , , and are leap years. However, there is still a small error that must be accounted for. To eliminate this error, the Gregorian calendar stipulates that a year that is evenly divisible by for example, is a leap year only if it is also evenly divisible by In a leap year, the extra day known as a leap day is added at the end of February, giving it 29 instead of the usual 28 days.

In the Gregorian calendar currently in use worldwide except perhaps the Russian and Iranian calendars , there is a leap year every year divisible by four except for years which are both divisible by and not divisible by Therefore, the year will be a leap year, but the years , , and were not. The complete list of leap years in the first half of the 21st century is therefore , , , , , , , , , , , , and What are your chances of being born on leap day?

About 1 in 1, People who are may be called leaplings or leapers When is the birthday party? How many people were born on leap day? The rules for determining a leap year Most years that can be divided evenly by 4 are leap years.

When did leap year originate? See also:. Leap Year Trending Here are the facts and trivia that people are buzzing about.