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A comment on White House directs NASA to create time standard for the moon. Parent comment

Re:White House directs NASA to create time standard for the ... by Qqqwxs on Wednesday April 03, 2024 @04:19PM (#39922546)
This comment made me curious.

Apparently, TAI specifically defines the second (in terms of cesium transitions) at sea level (where gravitational potential is equal). I never knew that second part.

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Re:White House directs NASA to create time standard for the ... by Xorathena on Wednesday April 03, 2024 @09:52PM (#39925698)
...and one level of language-precision further, these articles get into how "sea level" differs from "where gravitational potential is equal":

https://en.wikipedia.org/wiki/Ocean_surface_topography

https://en.wikipedia.org/wiki/Geoid

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