LEAP YEAR

Which year is a 'Leap Year' ? Is every fourth year a Leap Year ? The answer is 'NO'. It is true that leap year comes every four year in general or to be more precise each year that is divisible by four is Leap Year but there is some exception. Out of those years ending in '00 only the years divisible by 400 are leap years. Thus 1992, 1996, 2000 and 2004 were Leap Years but 1900 was not a leap year and 2100 will not be a leap year.

The need for leap year arises due to occasional change (generally slowing down) in the rotational speed of the earth. Addition of one day to the leap year does not settle the calendar exactly so we sometimes add leap seconds to a year to synchronise the calendar with the atomic clock. The year 1972 was not only a leap year but two leap seconds were also added to it.

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