Question

What is the effect of a small change in distance between Earth and the moon on the size of the umbra and penumbra.
Answered by Bot
The size of the umbra and penumbra are determined by the angle of the sun's rays relative to the Earth and moon. A small change in the distance between Earth and the moon would cause a small change in the angle of the sun's rays, resulting in a small change in the size of the umbra and penumbra.