Wednesday, February 25, 2004
About time [400]
Julius Caesar's calendar repeated every 28 years. The Gregorian Calendar we use today repeats only every 400 years. This is a result of removing the leap day from three out of every four century years (those not divisible by 400). It's usually true that this year's calendar will repeat in 28 years time, and this will be true for the rest of your lifetime, but around 2100 there will be seven consecutive non-leap-years (so, for example, 2088 won't repeat until 40 years later in 2128. One consequence of this 400-year repeating pattern is that a new century can only begin on a Monday (as in 2001), Tuesday, Thursday or Saturday - never on a Sunday, Wednesday or Friday.
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