Lunar Eclipse 2021: When and How to Watch the Beaver Moon Tonight

A partial lunar eclipse is expected to be visible before dawn on Friday, Nov. 19. The full moon will turn increasingly reddish-orange the more the Earth’s shadow covers it. But since it is a partial lunar eclipse, a sliver of the moon will remain visible even at maximum coverage, before the shadow retreats and the moon regains its normal hue.

A lunar eclipse happens when Earth gets in the way of the light from the sun hitting the moon. The moon looks red during a lunar eclipse because of the Earth’s atmosphere, which scatters blue light and only allows red to pass through.