I just want to point out that UTC isn't "astronomical time", which your comment seems to be implying. The timekeeper of UTC is an ensemble of atomic clocks in various locations around the world. The timekeeper of Greenwich Mean Time (GMT) is the rotating earth in orbit around the sun and involves astronomical observations to determine the time. By the way, the GPS has an ensemble of atomic clocks also, separate from UTC. There must be some effort towards harmonizing UTC and GPS time but I am too lazy to look it up.
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I just want to point out that UTC isn't "astronomical time", which your comment seems to be implying. The timekeeper of UTC is an ensemble of atomic clocks in various locations around the world. The timekeeper of Greenwich Mean Time (GMT) is the rotating earth in orbit around the sun and involves astronomical observations to determine the time. By the way, the GPS has an ensemble of atomic clocks also, separate from UTC. There must be some effort towards harmonizing UTC and GPS time but I am too lazy to look it up.