Tonight is a penumbral lunar eclipse:
You won’t see a dark “bite” taken from one edge of the moon Tuesday night.
You won’t see the moon turn coppery red, as it does during total eclipse of the moon.
But Earth’s shadow will brush the moon’s face Tuesday night, making it possible to witness a subtle kind of eclipse, called a penumbral eclipse of the moon. Earth’s long shadow has two parts: a dark inner umbra and a lighter surrounding penumbral. Only the lighter, outer penumbral shadow of Earth will fall on the moon’s face on Tuesday.