According to EarthSky.org, a penumbral lunar eclipse occurs when the Earth is positioned between the Sun and the Moon and, “the more diffuse outer shadow of the Earth – its penumbra – falls on the moon’s face.â€.
During the upcoming “Beaver Moon Eclipse,†a large portion of the Moon’s surface — about 83% of it — will pass behind Earth’s outer shadow.The upcoming penumbral eclipse the the first of two events in this year’s final “eclipse season,†Forbes reports