In an article like this I would have liked to see some mention of TAI (https://en.wikipedia.org/wiki/International_Atomic_Time https://en.wikipedia.org/wiki/Int

In an article like this I would have liked to see some mention of TAI (https://en.wikipedia.org/wiki/International_Atomic_Time https://en.wikipedia.org/wiki/International_Atomic_Time) as one of the alternatives to UTC. Unfortunately there are several different universal times. Apparently there's also a "Galileo System Time", for example.