I Do we know how many meters long one second is?

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The length of the world line of a particle at rest for one second can be calculated using the speed of light, resulting in approximately 300 million meters. This relationship indicates that time can be conceptually linked to distance through the speed of light. However, while it may seem that we "pass through time at the speed of light," this interpretation is limited and can lead to misunderstandings. Previous discussions have highlighted the confusion surrounding this concept. Overall, the connection between time and distance is significant but requires careful interpretation.
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Do we know how many meters long one second is?
In other words, how many meters long is the world line of a particle at rest for 1 second?
 
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student34 said:
Summary:: Do we know how many meters long one second is?

In other words, how many meters long is the world line of a particle at rest for 1 second?
The conversion factor from time to length is the speed of light. For an object at rest in some IRF for proper/coordinate time ##t##, the worldline has length ##ct##.

If ##t = 1s##, then the length of the worldline is approximately ##3 \times 10^{8} \ m##.
 
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I guess this means that we pass through time at the speed of light. Interesting.
 
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student34 said:
I guess this means that we pass through time at the speed of light.
While there is a sense in which this is true, it is a very limited sense and you can't really draw any useful inferences from it. We have had a number of previous PF threads dealing with the confusion caused by taking this statement too far.
 
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Thread 'Physical Interpretation of Frame Field'

Moderator's note: Spin-off from another thread due to topic change. In the second link referenced, there is a claim about a physical interpretation of frame field. Consider a family of observers whose worldlines fill a region of spacetime. Each of them carries a clock and a set of mutually orthogonal rulers. Each observer points in the (timelike) direction defined by its worldline's tangent at any given event along it. What about the rulers each of them carries ? My interpretation: each...
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