The measured value of the speed of light is about 300,000 km/s. suppose a futuristic space train is traveling at 200,000 km/s with its headlights on. if you could measure the speed of the light from the headlights, you would find it to be

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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