Well, to be honest, this is not entirely correct. You can't measure the size of the object in 3D game by orbiting it at certain speed. Simply because you do not know, what is your actual speed (it can be totally different from what your in-game speed gauge is saying).When you were told that orbiting Earth at a certain speed is a much more accurate method than landing and eyeballing the curvature of the horizon on your monitor (to say nothing of gauging scale through pre-alpha videos on youtube), you promptly ignored it. If you're so sure, go and measure.. then go park in Saturn's rings and tell me that Saturn is only some 100-200km in diameter (or whatever number you wish to claim). This all after being proven wrong about 1:1 being impossible in a 3d engine.
On the other side, the approximately correct measurement can be done with parallax measurement. Of course, only if game engine does not explicitly distort the geometry (the focal distance of in-game camera is at least partially similar to human eye).
After all, it can be a nice test in existing version of ED. Just use your ship and fly away from Earth and Sol and stop at the point where Earth will have the same diameter (in pixels) as Sol. From navigation, you should be able to see the distance to Sol and distance to Earth. Take calculator, do the math. Glitch is, that with this method, you only will see if approx. the Sol and Earth diameters are in right ratio. But this experiment will not tell you anything about actual size.
I am affraid that accurately measure the diameter of some moon, we will need to wait for ED Horizons. Maybe we will be able to measure the actual size with help of three ships and lot of patience.
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