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From: Mikko <mikko.levanto@iki.fi>
Newsgroups: sci.physics.relativity
Subject: Re: Approximately 300,000 km/s With Respect To What?
Date: Sun, 14 Jul 2024 13:19:42 +0300
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On 2024-07-13 08:08:44 +0000, Thomas Heger said:

> Am Freitag000012, 12.07.2024 um 11:26 schrieb Mikko:
>> On 2024-07-11 19:58:02 +0000, amirjf nin said:
>> 
>>> Approximately 300,000 km/s with respect to what?
>> 
>> Whenever the speec of something is measured it is measured with respect
>> to someting else. The report should make clear what is the reference that
>> is considered stationary. Usually it is the instruments used in the
>> measurement, and usually but not always they are at rest with restpect to
>> Earth surface at the place of the measurement.
>> 
> 
> 'Stationary' can be understood as 'not moving' and that as 'having
>  velocity zero'.

Yes, that is what the word means.

> But velocity would require a reference point, in respect to which the 
> object does not move.

That gives you a revefernce point: the object does not move in respect to
itself.

> But what was actually Einstein's reference, in respect to which 
> velocity v was measured.

Einstein did not measure velocity v.

-- 
Mikko