A new experiment for time synchronization, CTS or Cosmic Time Synchronization, has achieved successful wireless time synchronization at a precision of ~30 ns and 50-60 meters away. CTS has immunity to jamming/spoofing interference, can operate in environments where GPS cannot reach, and generally has cheaper maintenance. It is ideally suited for relatively cheap and reliable intra-city time synchronization including, for example, areas inside buildings, underwater tunnels, and subways
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