@dgoldsmith Given that UTC stands for Coordinated Universal Time (at least in English), it seems like it's in need of a renaming. Perhaps Coordinated Terrestrial Time?
I wonder if this will continue for other important celestial bodies? I wouldn't be surprised if at least Mars got its own time standard codified. Wikipedia mentions an "MTC", but only as a "proposed" standard based on Mars's orbit instead of atomic clocks.
@dgoldsmith Although it feels a little impractical to keep creating new standards for every celestial body we visit, perhaps we need a new standard somehow independent of general relativity... how about "Stardate"? 🖖