A YEC scientist questioned Jason Lisle regarding his choice of the Anisotropic Synchrony Convention (ASC) in his cosmological model. That scientist believes that the Einstein Synchrony Convention (ESC) is the more natural choice and correct choice for the cosmology of the Universe as well as the one that the biblical language uses. Dr Jason Lisle responds with the following.
For the sake of time, this will have to be my last clarification on the matter. But I’ll try to answer your most relevant questions and comments. Regarding your comment that “ASC says nothing about reality,” that would require some clarification. Both ESC and ASC are coordinate systems that describe the same underlying reality. (Perhaps that’s what you meant.) But the fact that either can be applied with equal legitimacy, each making correct predictions in regard to any relativistic experiment or observation, says something quite profound about reality. Namely, the universe is non-Newtonian, and our measurements of time and space are necessarily observer-dependent. As a result, one-way velocities are inherently conventional to some extent. This necessarily includes the one-way speed of light.
The relativistic nature of spacetime can be “pushed” conceptually from one place to another, but it cannot be eliminated. Your comment that using ASC “the imagined speed of light depends on its direction where the observer is” illustrates this – because the same type of thing is true of velocities under ESC. Under ESC observer A sees light moving at speed c relative to himself, and observer B sees light moving at speed c relative to herself, even if A and B are moving relative to each other! Moreover, if observer A accelerates, he will perceive that the light adjusts so that it is still speed c faster than himself. Under either convention the light seems to “know” what the observer is doing and instantly adjusts itself relative to any given observer. Like it or not, that’s the way the universe is.