"Nova: Solar Eclipse" (WETA and MPT at 9) PBS enlists scientists to comment on today’s once-in-a-lifetime event, which you might have missed anyhow. (Hey, we get it. Life is busy.) (Jay Pasachoff and Ron Dantowitz/PBS)

(All times Eastern.)

Bachelor in Paradise (ABC at 8 p.m.) A castoff from the most recent season of “The Bachelorette” arrives, eager to use his date card.

American Ninja Warrior (NBC at 8) Several returning competitors vie for a chance to compete in the national finals.

So You Think You Can Dance (Fox at 8) The top nine perform.

Preacher (AMC at 9) Jesse makes an unlikely connection.

Midnight, Texas (NBC at 10) Manfred’s relationship with Creek is threatened by a revelation about his past.

I Hart Food (Food at 10) YouTube personality Hannah Hart samples Southern fried fare in Asheville, N.C.

People of Earth (TBS at 10:30) Ozzie confronts Walsh.

Will (TNT at 11) Will is surprised when he discovers Alice’s new passion.

Premiere

The Good Karma Hospital (Acorn TV streaming) Amrita Acharia (“Game of Thrones”) stars as a rookie doctor who, after a breakup, leaves England to work at an under-resourced cottage hospital in southern India. Phyllis Logan (“Downton Abbey”) also stars.

SPECIAL

Great American Eclipse (Science Channel at 9) More eclipse coverage.

Late Night

Conan (TBS at 11) Matt LeBlanc, Brittany Snow, Myq Kaplan.

Daily Show (Comedy Central at 11) Joshua Green.

Fallon (NBC at 11:35) Repeat: Alex Rodriguez, Nick Kroll, Haim.

Colbert (CBS at 11:35) Repeat: Michael Moore, Sutton Foster, 6LACK.

Kimmel (ABC at 11:35) Repeat: Caitlyn Jenner, Finn Wittrock, Brett Young.

Corden (CBS at 12:35) Repeat: Nicole Kidman, Kit Harington, Ed Sheeran.

Meyers (NBC at 12:35) Repeat: Ice Cube, Kumail Nanjiani, Pete Buttigieg.

Bethonie Butler