Today is Leap Day. February 29th. Sure it's an oddity, and a lot of people don't "celebrate" it, but I like having fun with Leap Day. I hopping around and shouting at people "happy leap day!" and encouraging them to act like frogs?
Why do I do this? no reason. It's fun to watch people's reactions.
Leap Day came about because orbital mechanics are odd. The Earth rotates at one speed, and revolves around the sun at a different rate. This means that it comes out to roughly 265.25 days. Actually believe it or not it's not even that much. Every hundred years there'll be 30 days in February. Every 500 years or so there'll actually be 31.
Too bad I'll never see that. I don't think that the Julian calendar since it got fully firmed up has seen a February 31st. Its a bit of a shame. I wonder if future people will celebrate the 30th of February. . .