Even as a penumbral eclipse is happening in your sky, you might not notice anything different about the moon. On the other hand, very observant people can detect a dark shading on the moon’s face during a penumbral eclipse.
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The penumbral lunar eclipse of July 4-5, 2020 will be so nearly imperceptible that some will see nothing even while staring at it. Then again … very observant people will notice something strange happening on the moon, without knowing an eclipse is taking place. Who will see it (or not) in this post.