Wow man. Wow. This explanation- just, wow. So simple and elegant.

In “15.2 Time Dilation: Intuitive Explanation”, Dr. Greene states two definitions:
1. The speed of an object through space is “how much distance the object covers in a given amount of time that elapses on our laboratory clock; the clock that we have right here”.
2. The speed of an object through time is “the amount of time that has elapsed on that object compared to the amount of time that has elapsed on our clock here in the laboratory”.
He then instructs the us to:
“Just replace what we previously called space with what we’re now thinking about as time.”
to make the statements equivalent.

I don’t follow that by just simply using substitution that the two definitions are interchangeable. The original question still remains valid. To try to get to a point of equivalency, two concepts must be defined first.
1. That distance is the change in a location of an object relative to an observer as measured using an arbitrary coordinate system based on the observer’s location. The arbitrary coordinate system for example could be Cartesian or Polar using any convenient units.
2. That time is the change in a of an object relative to an observer as measured using an arbitrary coordinate system based on the observer’s . The arbitrary coordinate system for example could be any periodic, uniform event device using any convenient units.

Can someone fill in the for the definition of time (with “clock” being the periodic, uniform event device and therefore cannot be used in the ) or is there a better definition for distance and time that creates the equivalence that Dr. Greene assumes?

Cultural perception of both space and time may be different. Some may find spabe and time interchangeable by Muslim concepts of a shadow state, as i was taught by a Muslim.

You can’t make it less easier than this. Thank you!

So, the stationary observer always moves faster in time and gets older. But is there any stationary observer out there? I mean absolute stationary?

So, the stationary observer always moves faster in time and gets older. But is there any stationary observer out there? I mean absolute stationary?

So, the stationary observer always moves faster in time and gets older. But is there any stationary observer out there? I mean absolute stationary?