Why can a strong man not hold a weight on a chain completely straight? what is your weight on jupiter if the acceleration is 26m/s^2? ( there is no weight ) 

The strong man cant hold a weight on a chain completely straight due to the gravity and the mass of the chain/chair,

Acceleration due to gravity at surface radius = approx 23 (m/s)/s

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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