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

On 09-Dec-24 2:29 am, rhertz wrote:

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.
 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.
 The shuttles also had UTC clocks so that the astronauts could easily
figure out what the "official" time aboard ISS was.
 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.
  So, for ISS, t = t'. Einstein's SR time is not even considered, even
when there are several atomic clocks onboard.

For most practical purposes, the general relativity corrections to clocks on the ISS are irrelevant. Ordinary clocks are not even accurate enough for the corrections to be meaningful.
The corrections only matter when, well to pull an example out of thin air, you need to know exactly where satellites are and when signals were transmitted from them, so that you can calculate where you are on Earth based on the signals from several satellites.
Sylvia.