If you want to be the one to chart the path of the stars/planets then I'm sure you could figure something out. Though the problem with trying to apply physics to fantasy worlds is that unless the creator had incredible consistency and thought about how the physics of their world would work, then you'll probably find that a lot of shit just works because magic or because it's convenient.
Part of why we have such in depth physics knowledge of our world is because we want to know why certain things happen, like why are there seasons that happen once per year and what even is a year and why is it always the same. But in CoE, we already know why the year is 7 days long, because it's convenient for fitting with our 7 day work week, it fits with the Gregorian calendar. There are no back end rules that all just happen to lead to the game being the way it is. It's by design, by the gods(SBS) and sure there will be randomization and stuff that the gods- I mean SBS didn't directly oversee, but as far as the day/night cycle and seasons, their existence serves to make our experience of the game greater, not because that's how the universe works.
There might be areas that need to be studied, like the location of ore and mineral deposits based on the geography of the game since SBS won't be directly placing ore veins by hand, but my point still remains.
Most of the constellations will be designed by players with little to no physical basis. It will be aesthetically pleasing. That doesn't mean you can't interpret the meaning in astronomical stuff. It will just be astrology/theology since the gods(SBS) are real and every player knows this.