More on leap year

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The Gregorian calendar consists of Leap years that have 366 days, and ordinary years with 365 days. The earth takes 365 days, 5 hours and 49 minutes(11 minutes less than 6 hours) to make one revolution around the sun. Ordinary years take into account 365 days only, not the extra hours. These extra 6 hours add up to give one extra day every 4 years; this is the Leap year that has 366 days. So those years which are divisible by 4 are leap years. This extra day is added to February that has minimum number of days; thus instead of 28 days leap years have 29days. Now let us consider the 11 minutes, due to this we have leap years not only every 4 years but also every 400 years. To qualify for leap year, the century must be divisible by 400; thus 1700, 1800, 1900 are not leap years but 1600, 1800, 200, 2400 are leap years. I was told Julius Caesar introduced the concept of leap year about 2000 years ago, those divisible by 4 were considered as leap years. Thus numbers of leap years were more; this is rectified in Gregorian calendar, which we follow. [b]Hope you find this information useful. Add any information you have, let’s share knowledge and enrich our knowledge bank. Please comment on this and share your opinion. Thanks in advance.[/b] Let’s enjoy life to fullest. Professor ‘*^Bhuwan^*’. . 27/2/2012.