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From: clzb93ynxj@att.net (LaurenceClarkCrossen)
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Subject: Re: Why the time kept at the ISS is =?UTF-8?B?VVRDPyBBbmQgRWluc3RlaW4n?=
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Date: Thu, 12 Dec 2024 17:56:50 +0000
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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.
>>
>> 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.
>>
>
> Of course UTC is used in manned space crafts and space vehicles
> that need to communicate with the Earth.
>
>>
>> So, for ISS, t = t'. Einstein's SR time is not even considered, even
>> when there are several atomic clocks onboard.
>>
>> More yet, any space vehicle used to transport astro/cosmonauts keeps
>> time using UTC/GMT.
>
> Yes, of course!
>
>>
>> Reality dictates that the world is used to t = t'.
>
> This is a meaningless statement.
>
> 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.
>
> This is so thoroughly experimentally verified that it can be
> considered to be a fact, and nothing to discuss.
>
> https://paulba.no/pdf/Clock_rate.pdf
>
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.