Speed of Light
Have I opened a box? The answer seems to be refraction, so if the light bends around a star, then it is diverted because it passes through a denser medium adjacent to the star, so that is why when old navigators on Earth measure a low angle altitude, a correction is subtracted because the light is refracted in the denser medium of the Earth's atmosphere.
I dont mind the fun a bit Al!! I guess the dark bit bends as well***
Ernie.
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