is time a "dimension" I have been trying to figure this one out for some time now. I have read much on the subject, but it seems to be dealt with in such a cavalier fashion. So, here goes... We speak of space-time as if it were something packaged. I have a problem with this. Let me list the difficulties I have: Concerning position: 1. In physical 3-space, I can position an object anywhere I like, relative to an arbitrary (0,0,0) position. 2. After any arbitrary operation, the objects position can be anywhere in 3-space, including any previous position. 3. The object may be placed in + or - position relative to the origin. 4. Any operation changing the objects position instantiates or necessitates the creation of time. Without a change of position, there is no need to speak of time. 5. Changes in position may be made with an infinity of possible velocities and accelerations, positing "time" Concerning time: A. I have no control over the timing of an event - it always occurs at the present - dissimilar from item 1. B. I can never reuse the present or a previous time - dissimilar from item 2. C. Causality forces only forward motion in time - dissimilar from item 3. D. The flow of time does not instantiate a change of position - dissimilar from item 4. E. Time does not seem to have various rates of flow (relativity excepted) - dissimilar from item 5. It would seem, then, that time is only superficially similar to 3-space, in that it operates in some mathematical models in a fashion similar to the spatial distances. However, A-E behaviors are distinctly different from 1-5 behaviors. So, how can we group time with space? It would seem time is something wholly different, and perhaps not of the same substance. Any help?