On Friday, January 17, 2025 at 11:17:37 PM UTC-7 Brent Meeker wrote:




On 1/17/2025 6:13 PM, Alan Grayson wrote:

The inconsistency I see is that measurements done in the frame of the 
moving rod do NOT show that the rod in its frame is contracted, 

Nothing is ever Lorentz contracted in it's own frame because nothing is 
ever moving it it's own frame.


I am aware of that fact. AG 



even though this is ostensibly the prediction of the LT, from the pov of 
the stationary frame. 

No.  The prediction is that measurement of the rod from the stationary 
frame will find it to be shorter than it's length measured in it's own 
frame.  If you can't even keep straight that its RELATIVITY theory, there's 
no hope for you.


 I am aware of that fact. AG 


Brent


This is different compared to what happens in the frames of the TP, where 
the predicted slowing of the traveling twin's clock is immediately 
manifested in the frame of the traveling twin. 

No it is not.  It is only slow relative to the other twin's clock.


Yes, I am aware of that.  But what does the traveling twin actually measure 
his clock rate to be? Same as calculated by stationary twin on Earth? Still 
struggling with what the LT does for us. AG 

Do you understand what puzzles me?  AG

You confuse yourself because in one case you measure an accumulated 
interval over a path length and because it's time you are surprised (see a 
paradox) that they are different.  In the other case you measure a distance 
at one instant (unrealistically) and compare it to the same distance 
measured in another frame.  You don't consider measuring along two 
different paths between two events because you already know that two paths 
between the same events can have very different lengths and so it doesn't 
seem paradoxical.

Brent

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