This Is The Greatest Sports Day Of The Year – FiveThirtyEight

With nine NHL games, three NBA games, an NFL game and an MLB playoff game — made possible by the Chicago Cubs’ victory in Game 4 of the NLCS on Wednesday — Thursday is your (first) sports equinox of 2017.

What’s a sports equinox? As my former colleague Reuben Fischer-Baum wrote on a couple of occasions, it’s when all four major U.S. sports leagues — the NFL, NBA, NHL and MLB — play at least one game on the same day. Historically speaking, it doesn’t happen often. There have only been 17 sports equinoxes in history, including Thursday:

Another sports equinox is in the books

Dates on which all four major U.S. sports leagues (MLB, NBA, NFL and NHL) had at least one game

Amazingly, there was a 15-year period without a single sports equinox, between 1985 and 2001. And after 2001, seven more years passed without it happening. But sports equinoxes have occurred much more frequently in recent years — six have happened in the nine years since 2008. They might become even more common in the future, thanks to Thursday-night NFL becoming a fixture, the World Series often running later than usual, and a new NBA scheduling policy this season that moved the season’s opening night up by a week and a half.

If the Cubs can force Game 7 in the NLCS, Sunday will be another sports equinox. As will Oct. 29, if Game 5 of the World Series takes place. But even if those do happen, Thursday’s equinox will be the only one this season with the added bonus of college football — there are two FBS games tonight, including No. 25-ranked Memphis at Houston (A “Super Equinox”?). Good luck finding enough screens to watch it all!