The Ancient time machine is a device that enables instant and precise time travel over vast periods of time created by the rogue Ancient scientist named Janus. In the "main" timeline, this technology was banned by the Ancient Council in order to prevent dangers associated with time travel. (SGA: "Before I Sleep")

Against the wishes of the Council, Janus installed a time travel device inside at least one Gateship, which was put to use by the Tau'ri (who named it the "Time-Jumper"). At least one more Time Jumper was built, but it is unknown if Janus himself built it. And while the device was far more advanced than the Ancient's previous version, it only worked in jumps of more than a few hundred years. (SG1: "It's Good to Be King", "Moebius, Part 1", "Moebius, Part 2")

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