Time, to me, is change, from one position to another, from one spin to another. I look at time as an arrow cursor on the monitor. If I took 20 pictures of the the arrow cursor at different position and I told someone to place them in order. The person can because he/she has all 20 pictures. If I give the same person only 2 pictures, he/she will not know which direction is the start or end. If I give just 1 picture. Nothing has moved.
Time, for us, we look at not in a single frame but a series from the big bang till now. We get evolution, we get orbits, we get a direction of time of things ending and a new phoenix arising out of the ashes of the old.
We do experience change and clumsily call it time. Going backward in time means that eveything has to put into reverse or we're able to fold this world and punch a hole into it, or we're able to go faster than the speed of light, catch the light's reflection from earth, being able to analyse that light's reflection and get a movie picture of our past without participating in it.
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