Originally posted by FabianFnas
Counting isn't really neccessary. You flow forward in time nevertheless. You don't even have to close your eyes.
Getting backwards in time is harder. My boss don't understand that. When he sasy "I want that report on my desk yesterday!", he doesn't really know the fundamentals in temporal theory.
Even changing the rate forward is easy. All you have to do is move. Just that rate wouldn't be noticeable until you reach high speeds.
According to Stephen Hawking, backward time travel isn't possible at all for wormholes that are in close proximity because of feedback.
He used an analogy similar to the grandfather paradox but more instantaneous. You look through a wormhole seeing yourself loading a gun (which you have done previously). You shoot through the wormhole killing yourself with the gun you have just loaded, which will stop you being able to kill yourself.
If you were to think more instantaneous than that, radiation travelling through the wormhole will have an effect upon itself, which will loop around a bit like sound feedback between a microphone and speaker. This will have the effect of destroying the wormhole.
Supposedly backward time travel between wormholes which are distant from each other are possible, but it still can introduce paradoxes if events next to the wormholes are effecting each other in some way.