Quote: Originally Posted by Golden
In a lunar eclipse, the Earth sits directly between the Sun and Moon. The earth doesn't cast a shadow on the moon, except during a lunar eclipse. Check this out to understand lunar phases: Moon Phases / Lunar Phases Explained
Thanks for the link, it shined a bit of light on the subject. I understood an eclipse sufficiently, but not the phases of the moon, but that is now cleared up.
Somehow, since the moon always faces the same direction toward the Earth, I had thought that the phases had to be caused by the Earth's shadow, but I now see that it is not. I had thought that the dark side of the moon had to be on the backside of the moon, but I now see that was wrong also. The back side of the moon is lit in the same cycles as the front, but we can't see it from Earth, either dark or bright.