> In reality geocentric coordinates are unlikely to be used. But maybe it would be easier if they could be I agree. When objects interact with each other, havi

> In reality geocentric coordinates are unlikely to be used. But maybe it would be easier if they could be I agree. When objects interact with each other, having everything as (x,y,z) makes many things a lot easier. So in your example, ideally, you send the ship the (x,y,z) coordinates. Internally, we would have to worry about tides and figuring out exactly what the coordinates should be, but crew installing it would know exactly where to place it.