when things are too far away relative to you and too close in time, according to the theory of relativity, they are unordered in time. other things that are like this:
- if two people send each other text messages when there is transiently no service, there may be out of order delivery
- bid/ask spreads in financial markets; when the exact price can't be precisely determined (also an analog with the Heisenberg principal, in that you can determine the price by entering a bid yourself and moving it up until either it is filled or it hits the ask..)
- computer memory models; see [1]
- also, in this context, the finite speed of light combined with planck stuff might help to get rid of a real-valued (doubly infinite) time axis? Which might let you reason about the ordering of events in a discrete or at least more discretish way?