Re: Why the time kept at the ISS is UTC? And Einstein's time?

On Wed, 11 Dec 2024 13:41:55 +0000, Paul B. Andersen wrote:

Den 08.12.2024 19:29, skrev rhertz:

The International Space Station (ISS) uses Coordinated Universal Time
(UTC), also known as Greenwich Mean Time (GMT), as its standard time.
UTC is the scientific standard of timekeeping for the world and is based
on atomic clocks.
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The ISS is a partnership between five space agencies from 15 countries.
The station is continuously operated 24 hours a day, 7 days a week, 365
days a year. Crews from the U.S., Russia, Japan, Canada, and Europe live
and work on the ISS, which orbits Earth every 90 minutes.
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The shuttles also had UTC clocks so that the astronauts could easily
figure out what the "official" time aboard ISS was.
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It's a compromise for the Americans and Russians. The crew day begins at
about two in the morning in Houston and ends at about eleven at night in
Moscow.
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Of course UTC is used in manned space crafts and space vehicles
that need to communicate with the Earth.
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So, for ISS, t = t'. Einstein's SR time is not even considered, even
when there are several atomic clocks onboard.
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More yet, any space vehicle used to transport astro/cosmonauts keeps
time using UTC/GMT.

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Yes, of course!
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Reality dictates that the world is used to t = t'.

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This is a meaningless statement.
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The truth is that no clock which ticks out seconds as defined by SI
will stay synchronous with UTC, unless it is on the Earth's geoid.
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This is so thoroughly experimentally verified that it can be
considered to be a fact, and nothing to discuss.
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https://paulba.no/pdf/Clock_rate.pdf
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According to relativists here recently, the LT must be required due to
the motion of the Earth, even though it is only 1/10,000th the speed of
light.
The GPS has to communicate with the Earth.
Seconds defined by SI are defined by atomic clocks, so atomic clocks
move at a different rate in space. Inferring that time runs at a
different rate is absurd. The rate of combustion of rocket fuel remains
the same.