Melissa & Joey 8 p.m., ABC Family
OMG, this is former teen star heaven. Joey Lawrence from “Blossom’’ and Melissa Joan Hart from “Sabrina, the Teenage Witch’’ are in a new sitcom. She’s a local politician, he’s the nanny who takes care of her teenage niece and nephew. Here’s betting that high jinks and flirtation ensue. Pictured: Vernee Watson-Johnson (left) and Hart.
Explorer 10 p.m., National Geographic
Tonight’s episode tells the story of a moment that changed the world — the dropping of the atomic bomb on Hiroshima on Aug. 6, 1945. The hour will focus on the 24-hour period after the bomb, through the eyes of those in the air and on the ground. Also included: the last interview with the officer who armed the bomb.
The Rachel Zoe Project 10 p.m., Bravo
Don’t forget to time your aspirin.
Wipeout 8 p.m., Channel 5
The Unbalanced Beams. Hey, I know one of them.
Shaq Vs. 9 p.m., Channel 5
Cook off, Rachael Ray.
The Big C 10:30 p.m., Showtime
White Collar 9 p.m., USA
John Larroquette finds a show he hasn’t already guest starred on.