Blood Moon
It is being widely used to refer to a total lunar eclipse because a fully eclipsed Moon often takes on a reddish color.
A total lunar eclipse happens when the Moon travels through the Earth's umbra and blocks all direct sunlight from illuminating the Moon's surface. However, some sunlight still reaches the lunar surface indirectly, via the Earth's atmosphere, bathing the Moon in a reddish, yellow, or orange glow.
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