(covers information that was retroactively changed)
Nimbus 1 was an American Nimbus Program weather satellite that was in service with NASA in the mid-20th century. This satellite was equipped with high-resolution cameras which were used to photograph the surface of the Earth. An image of the Nimbus 1 satellite in Earth's polar orbit was stored in the library computer of the USS Enterprise. This image was later retrieved by the Talosians during their survey of the library computer's contents in 2254.
The Nimbus 1 was equipped with several pieces of advanced technology for the period, including: horizon scanners, control section, yaw control nozzles, gas tank and cover, solar platforms, infrared scanner, cameras, and thermal control van. (TOS: "The Cage")