NASA launches Aplications Technology Satellite-1, the first of a new series of experimental satellites with a goal of combining the functions of existing weather and communication satellites, with other technology demonstrations added on. ATS-1 transmits the first-ever view of the entire face of Earth visible from geosynchronous orbit, as well as testing some of the first satellite navigation technology. ATS-1’s position in orbit also proves ideal for the North-America-to-Australia link during 1967’s global Our World broadcast. ATS-1 remains in serice for almost exactly 12 years.
The 41st episode of Irwin Allen’s science fiction series Lost In Space premieres on CBS, starring Guy Williams, June Lockhart, and Jonathan Harris.
The 
BBC2 airs the 21st episode of science fiction anthology series Out Of The Unknown. Adapted by Hugh Whitmore from a story by Larry Eisenberg, the story stars Ed Begley. This episode no longer exists in the BBC’s archives.
The 13th episode of Irwin Allen’s science fiction series The Time Tunnel airs on ABC, starring James Darren and Robert Colbert. Rhodes Reason, Whit Bissell, and Lee Meriwether geust star.
The 
The 14th episode of the time travel sitcom It’s About Time, created by Sherwood Schwarz (I Dream Of Jeannie) and starring Frank Aletter, Jack Mullaney, and Imogene Coca, is broadcast on CBS. Gary Nelson (future director of The Black Hole) directs.
The 71st episode of Irwin Allen’s adventure series Voyage To The Bottom Of The Sea airs on ABC, starring Richard Basehart and David Hedison. John Lupton guest stars.
French astronomer Audouin Dollfus discovers Janus, the tenth discovered natural satellite of the planet Saturn, orbiting just beyond the outer edge of Saturn’s ring. Confusion is caused when, mere days later, an American astronomer discovers another body in a near-identical orbit that cannot be reconciled with the orbit calculated for Janus. Only in the late 1970s will a theory emerge that explains the inconsistencies as the presence of two moons moving around Saturn as a co-orbital pair, occasionally swapping positions. Janus’ existence will be verified in 1980 by Voyager 1. (Janus is shown here in a 21st century Cassini photo.)
The 
Toho releases 
The 
Just days after the discovery of a satellite in a near-identical orbit, U.S. Naval Observatory astronomer Richard Walker discovers Epimetheus, another natural satellite of the planet Saturn, again orbiting just beyond the outer edge of Saturn’s ring. Many of Walker’s fellow astronomers believe this is merely a second sighting of Janus, discovered mere days before, but irregularities in the computed orbits vex astronomers well into the 1970s, at which point it is conceded that the observations are best explained by two satellites in a very close orbit to one another. Epimetheus and Janus will next be spotted by Voyager 1 in 1980, conclusively proving the existence of two bodies. Epimetheus’ name won’t be made official until 1983. (Epimetheus is shown here in a 21st century Cassini photo.)
The Soviet Union launches unmanned space probe Luna 13 toward the moon, where it becomes the third space vehicle to successfully make a soft landing on the lunar surface. Larger than its Soviet predecessor, Luna 9, Luna 13 measures the temperature, radiation, and hardness of the moon’s surface, all useful information to have in advance of a manned landing. After operating on the lunar surface for four days, the Luna 13 lander’s batteries are exhausted and the mission is over.
UK broadcaster ATV Midlands airs the 32nd episode of Gerry Anderson’s Supermarionation science fiction series Thunderbirds, featuring the voices of Shane Rimmer, David Graham, Sylvia Anderson, Ray Barrett, and Peter Dyneley. This is the final episode of the series, as well as a Christmas special.
The 
The 17th episode of the spy-fi series Adam Adamant Lives! airs on BBC1, starring Gerald Harper and Juliet Harmer. Along with much of the rest of the season, the second season premiere is missing from the BBC archives.