The last potion of the my statement should have read: 2. That time is the change in a blank of an object relative to an observer as measured using an arbitrary coordinate system based on the observer’s blank. The arbitrary coordinate system for example could be any periodic, uniform event device using any convenient units. Can someone fill in the blanks for the definition of time (with "clock" being the periodic, uniform event device and therefore cannot be used in the blanks) or is there a better definition for distance and time that creates the equivalence that Dr. Greene assumes? The original had "< b l a n k >" which was edited out when I submitted the reply.

I don't think he is saying substitute but extend the metric for distance from 3 dimensions to 4 dimensions (3 space and 1 time). This metric doesn't exist in space but in the new 4 dimensional concept of spacetime.

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?