What are the reasons we think we can only move in one direction in time?

Question

I recently was told that we know there’s only one time dimension because otherwise we’d pivot between different dimensions of time, as we are able to do in space. But I still don’t understand, other than paradoxes and causality, why we can’t move backwards in time.

Even on a 1D spatial plane [edit to say yes… a line, not a plane.] we would be able to move forwards and backwards.

But we can’t with time. Why?

In: Physics

Answer 1

> Even on a 1D spatial plane

A 1D “Spatial plane” is a Dot. not a line.

You cannot move forward or backward on a dot.