How does Ra measure Time?

[anagogy]

Technology in a given density cannot be independent of the development of the entities. If technology is provided to entities before their time, they have the risk of destroying themselves and their environment. Atlantis is a good example. Maldek, also another good example.

Densities reflect the nature of the ray they pertain to. Technology too, must stay within the nature of the relevant major ray. Only towards the end of the density new strides may be possible, as how 3rd density was mentioned to be needing some capacity to manipulate its environment.

I don't see what any of that has to do with developing or not developing the technology to time travel. I think you might be drawing arbitrary lines in the sand.

Take Atlantis, for example, since you brought it up. You were pointing out that they got advanced technology before they were mature enough to handle it and they destroyed themselves.

But the fact that they weren't "mature enough" didn't stop them from developing and using that technology. The same is true for 4D entities. They may or may not be mature enough to handle the technology, but that doesn't mean they won't have access to it.