![]() By whom was the leap year invented Leap years were first introduced in the Western calendar. Of course, the same can be said about the year 1600. Some of the leap years are 2000, 2004, 2008, 2012, 2016, and 2020. 1600, 2000, 2400), it IS a leap year.ĭoes that sound too complicated? Well, since the next exception is not until the year 2400, we can pretty safely use the “divisible by 4” rule for the foreseeable future. The number 2000 is evenly divisible by 400, so it was a leap year even though it can also be evenly divided by 100. However, when a century year is divisible by 400 (e.g.Julius Caesar devised the leap year to correct for the fact that the earth. To correct for this error, we sometimes skip leap years based on these two important rules: The year 2000 is special-even though it isn't the start of the 21st century-because it is a leap year. Since our calendar is only short 5 hours, 48 minutes and 45 seconds in most years, adding a full 24 hours every 4 years slightly overcompensates for the actual difference between the calendar year and the time it takes to circle around the sun. Wait! You might realize that the numbers don’t seem to work out completely. To compensate for these extra hours, we celebrate leap year just about every four years by adding a leap day at the end of our shortest month on February 29. This means that years such as 1992, 1996 are leap years because they are divisible by 4 and are not affected by the rest of the rule which applies to century. So every 4 years, these extra hours add up to 24 hours, which conveniently add up to one whole day. According to these rules, the years 20 are. Will 2020 be a leap year 2020 is divisible 4 ( 505). So, we conclude that 2000 was a leap year. The history of the rules is rather involved.Many people would confidently answer “365 days, of course!” But did you know that it actually takes 365 days, 5 hours, 48 minutes and 45 seconds for Earth to circle around the sun? This means that a 365-day calendar year doesn’t count the almost 6 extra hours every year! In our modern-day Gregorian calendar, three criteria must be taken into account to identify leap years. Was 2000 a leap year 2000 is divisible 4 (2000/4 500). These three rules are trying to keep the seasons near fixed dates on the calendar, with the first day of spring (the vernal equinox) near March 21.Īlthough other rules have been proposed in attempts to improve on the rules of 1582, none has been adopted for civil purposes. If divisible evenly by 400, a Gregorian year is a leap year so the year 2000 is a leap year. ![]() If divisible evenly by 100, a Gregorian year is a normal year with 365 days (e.g.1900/100=19, so 1900 is a normal year of 365 days as is 2100), UNLESS.Which as the day isnt always 24 hours we adjust by adding 'atomic' seconds every now and then. ![]() Apart from that, every year divisible by 4 (2012, 2016, 2020, 2024, etc.) is a leap year. Now, lets remove 10 public holidays that do not fall during a weekend and we obtain 250 working days in 2000. So 20 are leap years but 1800, 1900, 2100, 22 are not. Now the average year is 365.2425 which is too long but only by 26 seconds. Here is the detail of the calculation: Because 2000 is a leap year, it has 366 days. The 3 conditions for a given year be a leap year are: The year is exactly divisible by four (with no reminder) If the year is divisible by 100 (years ending in two zeros), it is not a leap, except if It is also divisible by 400 (in this case it will be a leap year). 1996/4 = 499, so 1996 is a leap year), UNLESS So we add a leap year every 400 years (we had one in 16 and will in 2400).
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