system
Given the following post, respond as if you're commenting on Reddit:
human
Does it take energy to move through time?

Struggled with the wording of the title. This isn't a "time traveling" question.

We know that it takes energy to move through the three dimensions of space. So when considering time as the fourth dimension either separate or as a combined with space as a single continuum, does it take energy to move through time?

In short, is there a Delta-v for moving through time.

Edit: My wording was incorrect. I was just trying to express the picture in my head. I realize that it does not take energy to move through space, but energy (acceleration) was required for an object to reach it's current velocity . F=ma, so another way to look at it is like this. If our current movement through time is F, then what was the a(acceleration) that brought us to our current rate.

**Edit 2: Second thought, is there energy associated with our movement through time?**

**Thank you all for the great input. Certainly the key to a great answer is a great question, sorry if that was a little fuzzy, but I'm very impressed with where this went and it certainly helped my understanding**
gpt
No, nor does it take energy to move through space.  It takes work (ie. an expenditure/transfer of energy) to *change* your motion through space.  That is, it takes work to cause an acceleration.  

Now remember that velocity is relative, not absolute.  That is, you can never say how fast something is moving in an absolute sense, only how fast it's moving *relative to* something else.  You are always sitting still (unless you're *accelerating*) from your own perspective.

All of these rules for motion through space also apply to "motion through time," that is, the rate at which time passes.  From your own perspective, time always passes at the same rate, but from the perspective of someone else watching you, that rate depends on your velocity relative to that observer.  This relative rate can change by changing that velocity, aka. accelerating, which requires work, aka. an expenditure of energy.