The penumbra refers to part of the shadow cast during an eclipse.
Penumbras occur in both solar and lunar eclipses .
Sure, a decrease in gravity wouldn't affect any sort of physiologic process that's governed by hormone levels. Well, first of all, you need to figure out your mass. Your mass is your weight divided by the force of gravity. Now, divide your weight by 9.8, which is the force of gravity on Earth. The number you get is your mass.