On 24/08/2020 18:48, William Unruh wrote:
You need it to be fixed, eg to the stars.
The stars move, and, in any case, most people want solar time, not sidereal time. Even solar time varies throughout the year. I think the "mean" in GMT refers to the fact that midnight is only true on average.
Sidereal time still needs a reference point on the earth that is in earth surface coordinates, not galactic ones.
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