The first of 10 episodes from the popular Sci Fi Channel series’ third season debuted Jan. 21 to a lukewarm 1.4 household rating/1.8 million viewers, according to an ABC Cable Networks Group analysis of Nielsen Media Research data. That’s below the 1.9 rating/2.1 million viewers the show averaged during the second half of its sophomore season from January-March 2006, when it aired on Friday nights, along with lead-in series Stargate Atlantis and Stargate SG-1. … … Despite the ratings falloff, the network said Battlestar was the No. 1 basic-cable entertainment program for the day among viewers 18-49 and 25-54. It also increased its viewership among those two demos by 60% and 18%, respectively, compared with its Dec. 15 finale. …Read all of Multichannel’s story here. Tonight’s episode is said to deal with the disposition of Baltar, and the disposition of the Dee-Lee-Kara-Sam quadrangle. 10 p.m. Sunday. SciFi.