Date: Wed, 17 Jul 2024 14:18:04 +0200
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Subject: Re: Approximately 300,000 km/s With Respect To What?
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W dniu 17.07.2024 o 12:27, Mikko pisze:
> On 2024-07-16 07:26:07 +0000, Thomas Heger said:
> 
>> Am Montag000015, 15.07.2024 um 11:05 schrieb Mikko:
>>> On 2024-07-15 06:26:42 +0000, Thomas Heger said:
>>>
>>>> Am Sonntag000014, 14.07.2024 um 12:19 schrieb Mikko:
>>>>> 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.
>>>>>
>>>>
>>>> Actually I have used this setting in my 'book' and declared, that 
>>>> all observers regard themselves as non-moving.
>>>
>>> That is possible but not always the best idea. In the real world an 
>>> observer
>>> often considers oneself as moving and someting else as stationary. Often
>>> it is better to choose samething inertial for "statinary" when the 
>>> observer
>>> is not inertial.
>>>
>> Sure, but 'non-inertial observers' where not included in SRT.
> 
> Not intentionally but SRT can be used for calculations of what a 
> non-inertial
> observer would see.

And, as anyone can check at GPS - the result
will have nothing in common with what a real
observer will really see.