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Newsgroups: sci.physics.relativity
Subject: Re: Approximately 300,000 km/s With Respect To What?
From: nospam@de-ster.demon.nl (J. J. Lodder)
Reply-To: jjlxa31@xs4all.nl (J. J. Lodder)
Date: Wed, 17 Jul 2024 21:29:49 +0200
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Mikko <mikko.levanto@iki.fi> wrote:

> On 2024-07-16 10:58:32 +0000, J. J. Lodder said:
> 
> > Mikko <mikko.levanto@iki.fi> wrote:
> > 
> >> On 2024-07-12 09:55:27 +0000, J. J. Lodder said:
> >> 
> >>> Mikko <mikko.levanto@iki.fi> wrote:
> >>> 
> >>>> 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.
> >>> 
> >>> You really need to have a look at what and how is actually measured,
> >>> instead of elaborating your own ideas of measurement.
> >> 
> >> Yes, that is a correct interpretation of my words. Of course, what and
> >> how is not alwasys the same so you need to look at thar separately for
> >> each measurement.
> > 
> > The first electromagnetic measurement of the 'speed of light',
> > by Weber and Kohlrausch, didn't involve any velocity at all.
> > They pointed the way for Maxwell.
> > 
> > Maxwell's equations [1] likewise have a   c  in them
> > but no velocity,
> > 
> > Jan
> > 
> > [1] In Heaviside-Lorentz units for example.
> 
> One may even regard c as the conversion factor between meters and seoonds
> just like 25,4 is the conversion factor between metric inches and meters.

Yes, it is as fundamental as 12 inch to the foot,

Jan