“Friday Night Lights” (9 p.m., NBC): Last fall, NBC made a big miscalculation with

“Friday Night Lights” (9 p.m., NBC): Last fall, NBC made a big miscalculation with “Friday Night Lights,” airing it on a night that wasn’t Friday. This confused many viewers. After all, “Saturday Night Live” airs on Saturdays — not on, say, Thursdays. The season wore on, and “Friday Night Lights,” a critical hit, was praised as a splendid depiction of small-town Texas life where high school football is king. At the end of last season, “Friday Night Lights” won the prestigious Peabody Award. Ratings still weren’t good. Even so, NBC renewed the series for another year. Better yet, it slotted “Friday Night Lights” on Friday nights. And that is where “Friday Night Lights” can be found this Friday at 9 p.m. with its second-season premiere.

As summer comes to an end in Dillon, Texas, all thoughts are on the upcoming football season for the defending state champ Panthers. Meanwhile, the coach who guided the team to that championship, Eric Taylor (the superb Kyle Chandler), is starting his new job at a college out of town, which separates him from his family just as wife Tami (Connie Britton) goes into labor with their second child. There’s a lot of action, feelings and good-looking young people on “Friday Night Lights,” but there’s a dose of truth, as well.

“Mysterious Journeys” (9 p.m., Travel Channel): The Gettysburg battlefield is the first stop for this new series, which investigates supposedly haunted locales and supernatural secrets.