You may have noticed that tomorrow is February 29th, sometimes labeled as Leap Day. Even if you haven't, you probably noticed that the Summer Olympics and the U.S. presidential election is happening this year, which means this is a Leap Year. C.G.P. Grey explains why we have a February 29th, but only once every four years. -via Laughing Squid
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I am on the road and haven't watched the video yet, and perhaps the point I'm about to make is addressed there. The year 2000 was a presidential election year and featured the Olympics, but was not a Leap Year because century-years that are divisible by four are not Leap Years.
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That is right MOST of the time... but 2000 WAS a leap year because it was divisible by 400. That made up a very tiny correction in the calculated fraction.
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What about leap seconds?
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