Time is something we all understand until we try to explain it to another who doesn’t, for as Saint Augustine wrote over eight centuries ago:
“What is time then? If nobody asks me, I know; but if I were desirous to explain it to one that should ask me, plainly I do not know.” (Chadwick, 2008).
Not a lot has changed since, e.g. if time is a dimension as some say, we could move back and forth along it, but no evidence suggests that we can. Or if time changes, as relativity says, what does it change with respect to? Surely not itself, as that seems unreasonable. This section addresses such questions by reverse engineering time:
QR2.3.1 Time Changes
QR2.3.2 Time Travel
QR2.3.3 Specifying Time
QR2.3.4 Reality is Here Now