Consider a rotating object. On that object, select a single point that rotates. How does the angular velocity vector of that point compare to the linear velocity vector at that point

 v = w r

Explanation:

The linear and angular variables are related, specifically the linear velocity is equal to the angular velocity multiplied vectorially by the radius

          v = w x r

in general if the radius and the angular velocity are perpendicular

          sin  90 = 1

          v = w r

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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