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The ninth episode of Douglas Adams’ breakthrough radio science fiction comedy series The Hitchhiker’s Guide To The Galaxy is first broadcast on BBC Radio, continuing the second series of the now-hit cult science fiction phenomenon. (Some elements of the second radio series will go on to form the basis of Adams’ novel The Restaurant At The End Of The Universe.) 
The tenth episode of Douglas Adams’ breakthrough radio science fiction comedy series The Hitchhiker’s Guide To The Galaxy is first broadcast on BBC Radio, continuing the second series of the now-hit cult science fiction phenomenon. At this point, the story diverges into material that will not be repeated in later iterations of Hitchhiker’s Guide; Rula Lenska and John Le Mesurier guest star.
NBC airs the 15th episode of Buck Rogers In The 25th Century. Pamela Hensley and Michael Ansara guest star.
The 11th episode of Douglas Adams’ breakthrough radio science fiction comedy series The Hitchhiker’s Guide To The Galaxy is first broadcast on BBC Radio, continuing the second series of the now-hit cult science fiction phenomenon. At this point, the story has diverged into material that will not be repeated in later iterations of Hitchhiker’s Guide; Rula Lenska guest stars.
The 46th episode of the live-action series based on Marvel’s comic The Incredible Hulk airs on CBS, starring Bill Bixby, Jack Colvin, and Lou Ferrigno. Louise Sorel guest stars.
This series is not yet fully chronicled in the LogBook. You could help change that.
The 12th episode of Douglas Adams’ breakthrough radio science fiction comedy series The Hitchhiker’s Guide To The Galaxy is first broadcast on BBC Radio, ending the second series of the now-hit cult science fiction phenomenon. The conclusion of this episode effectively ends the series, though this ending is ignored by all later Hitchhiker’s Guide media, including the 21st century revival of the radio series, which will take its cues from Adams’ post-radio-series novels. Jonathan Pryce, Rula Lenska, and Ken Campbell guest star.
The first episode of a vastly retooled Battlestar Galactica (or, depending on how you look at it, the first episode of the show’s second season) premieres on ABC, with an almost completely new cast. Kent McCord, Robin Douglass and Barry Van Dyke take over as the series leads; the only holdovers from the original season are Lorne Greene as Adama and Herb Jefferson as Boomer.
BBC1 premieres the 30th episode of Terry Nation’s science fiction series Blake’s 7.
NBC airs the third installment of the lavish three-part miniseries based on Ray Bradbury’s The Martian Chronicles. Adapted for TV by respected SF author Richard Matheson, the miniseries has already taken an embarrassing public beating by none other than Bradbury itself, inspiring NBC to yank the heavily-publicized off of the fall 1979 schedule and burn off the miniseries in January 1980 prior to the 1980 Winter Oympics. Rock Hudson, Barry Morse (Space: 1999) and Bernadette Peters star. The miniseries is a co-production between NBC and the BBC (who won’t air it until later in 1980).
NBC airs the 16th episode of Buck Rogers In The 25th Century.
The 47th episode of the live-action series based on Marvel’s comic The Incredible Hulk airs on CBS, starring Bill Bixby, Jack Colvin, and Lou Ferrigno.
This series is not yet fully chronicled in the LogBook. You could help change that.
The second episode of a vastly retooled Battlestar Galactica (or, depending on how you look at it, the show’s 23rd episode) premieres on ABC, continuing a three-part storyline.
BBC1 premieres the 31st episode of Terry Nation’s science fiction series Blake’s 7.
NBC airs the 17th episode of Buck Rogers In The 25th Century. Timed to coincide with the 1980 Winter Olympics, the episode guest stars former Olympic athletes Thomas Henderson and Carlos Palomino.
The 48th episode of the live-action series based on Marvel’s comic The Incredible Hulk airs on CBS, starring Bill Bixby, Jack Colvin, and Lou Ferrigno.
This series is not yet fully chronicled in the LogBook. You could help change that.
The third episode of a vastly retooled Battlestar Galactica (or, depending on how you look at it, the show’s 24th episode) premieres on ABC, concluding a three-part storyline.
BBC1 premieres the 32nd episode of Terry Nation’s science fiction series Blake’s 7. Colin Baker (Doctor Who) and Valentine Dyall guest star.
NASA launches the unmanned Solar Maximum Mission satellite atop a Delta 3910 rocket, to study cyclical solar flare activity from Earth orbit. Built by Fairchild and relying on a magnetic reaction wheel system to maintain precise aim at the sun, “Solar Max” suffers malfunctions in orbit, and will be able to carry out only limited observations by November 1980. In 1984, Solar Max will become the first satellite to be repaired in-orbit by a visiting space shuttle crew. After repairs, the satellite will be released, with its life span in orbit having effectively doubled. It will remain in orbit, and functional, through 1989.
NBC airs the 18th episode of Buck Rogers In The 25th Century. Mary Woronov and Anne Lockhart guest star.
The 49th episode of the live-action series based on Marvel’s comic The Incredible Hulk airs on CBS, starring Bill Bixby, Jack Colvin, and Lou Ferrigno.
This series is not yet fully chronicled in the LogBook. You could help change that.
BBC1 premieres the 33nd episode of Terry Nation’s science fiction series Blake’s 7.
NBC airs the 19th episode of Buck Rogers In The 25th Century. Jerry Orbach (Law & Order) and Richard Moll (Night Court) guest star. 
The 50th episode of the live-action series based on Marvel’s comic The Incredible Hulk airs on CBS, starring Bill Bixby, Jack Colvin, and Lou Ferrigno.
This series is not yet fully chronicled in the LogBook. You could help change that.
Corvus Systems introduces its Winchester hard disk drive for the Apple II computer, available with five or ten megabytes of storage. A bulky device requiring its own power supply independent of the computer to which it’s connected, the Winchester drive carries a $5,000 price tag and an unconventional data backup system, Corvus Mirror, which uses videocassettes (also a fairly new technology). As the investment in this new mass storage technology is fairly daunting, Corvus will introduce a networking system the following year to allow multiple computers access to a single hard drive.
BBC1 premieres the 34th episode of Terry Nation’s science fiction series Blake’s 7.
The 51st episode of the live-action series based on Marvel’s comic The Incredible Hulk airs on CBS, starring Bill Bixby, Jack Colvin, and Lou Ferrigno. Jeanette Nolan guest stars.
This series is not yet fully chronicled in the LogBook. You could help change that.
ITV airs the tenth episode of Roald Dahl’s anthology series Tales Of The Unexpected, hosted by the author himself and adapted from his short stories. Timothy West and Susan George guest star in the second season premiere.
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BBC1 premieres the 35th episode of Terry Nation’s science fiction series Blake’s 7. This episode, written by fantasy novelist Tanith Lee, is unique in that it features only the regular cast with no speaking guest stars.
Atari releases the computer game Star Raiders for the Atari 400 and 800 home computer systems, programmed by Doug Neubauer. This is a very early example of a game in the first-person “cockpit” space shooter genre gaining wide popularity.
Attempting to build a TV franchise onto the 1973 hit movie Westworld, the first episode of Beyond Westworld airs on CBS, starring Jim McMullan and James Wainwright. Cassandra Peterson (later better known as Elvira) guest stars.