Most of you probably know that the earth's orbit around the sun takes 365 and a quarter days, thus necessitating this extra day in February called Leap Day, every four years. It's kind of fun! Maybe you know someone who was born on February 29 and you enjoy making jokes about how they're only turning eight this year, or whatever. But did you know that because of the imperfection of this math, and the fact that the earth's orbit is, more exactly, 365.24219 days, we actually have to correct for the extra time we accrue with Leap Days every 100 years by skipping the Leap Year tradition, thereby re-correcting and shaving off an extra day.

But, as the video from Vox explains above, this then sets us a bit behind over longer spans, which necessitates skipping the skipped Leap Year every 400 years, and doing it anyway, as we did in 2000 — 11 Points further explains that in years that are also divisible by 400, there will always be a Leap Year, but otherwise, the turn of a century is always going to skip the leap year tradition. Therefore, though very few of us are likely to still be alive, there will be no Leap Day in the year 2100.

Of course Neil deGrasse Tyson has jumped into the conversation on Twitter to point out that this is all arbitrary, and there's no reason why we couldn't solve the partial day problem in other ways.

An extra "Leap Week" might be sort of awesome, actually.

30 Rock most famously celebrated (and mocked) Leap Day by creating a series of fictional traditions that only exist in the show's parallel reality, like Leap Day William, who exchanges candy for children's tears. Also, it's a "magical extra day" in which you get to do the things you would never do in real life, all while wearing blue and yellow.

Co-creator Robert Carlock tells Vulture that it was one of his "favorite episodes to be involved in," and "The hardest part was the three-line exchange explaining how this had never been discussed before, why it was such a big deal, and why Liz Lemon didn't know about it when we saw her four years ago during the previous Leap Day."

As you can hear in the full-episode video below, she first explains that she grew up in Amish country and didn't really know anything outside of Amish holidays, and the reason she missed the office celebration four years earlier was "certainly" not because she was "on a Michael's Crafts crafting cruise."