Democratic convention: The cable networks — CNN, C-SPAN, FNC, MSNBC — will provide coverage pretty much all day long. In prime time, vice-presidential nominee Sen. Joe Biden gives his speech. PBS (Ch. 7) will be on from 7-10 p.m.; ABC (Ch. 4), CBS (Ch. 2) and NBC (Ch. 5) all plan an hour at 8 p.m.

Greatest American Dog (7 p.m., Ch. 2): The canine competition continues.

America's Got Talent (7 and 9 p.m., Ch. 5): The incomprehensible competition continues, and it's another split episode — an hour before the Democratic convention, an hour after.

Mythbusters (10 p.m., Discovery): The guys test the myth that the moon landings were a hoax.