Ratings Chart Attack!

“America’s Got Talent” debuted Wednesday night to an eight-month non-Olympics NBC high, while CBS’ “Greatest American Dog” enjoyed a substantial uptick from last week.

“Talent” captured the night with a 2.8 rating/8 share in the 18- to 49-year-old demographic, according to Nielsen Media Research.

While that’s a season low for “Talent,” it dominated the night in a brand-new time slot, beating its closest competitors by a full ratings point.

And as always, the Democratic National Convention rolled on the Big Three networks at 10 p.m. yesterday. Get up to speed on how they did here.

NBC finished the night in first place with a 2.3/7.

Fox placed second with “Bones” repeats, landing a 1.8/5. Third-place CBS, with a 1.5/4, saw a nice 31% increase week-to-week with “Dog,” which rolled in a 1.7/5.

ABC took fourth with a 1.1/3 and The CW brought up the rear with a 0.4/1.

What to Watch for Tonight:

NBC, ABC and CBS: Mr. Hope McChange himself, Sen. Barack Obama, accepts his party’s nomination during the Democratic National Convention at Invesco Field in Denver at 10 p.m. EDT.

Fox: “The Moment of Truth” returns after a monthlong hiatus with a new two-hour episode at 8 p.m. This episode includes Mark Walberg just skipping the whole truth-detector shtick, and he ends up just reading random diary pages and medical records of tonight’s contestants.