blood moon

American  

[bluhd moon] / ˈblʌd ˌmun /

noun

1. a total lunar eclipse, during which a small amount of the sun’s light is refracted through the earth’s atmosphere, causing the blue wavelengths to scatter and allowing more of the red wavelengths to reach the moon.

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Etymology

Origin of blood moon

First recorded in 1870–75

Example Sentences

This week Prince Harry met his father, the King, for the first time in more than a year, Pope Leo canonised the first millennial saint, and large parts of the world were bathed in the glow of a Blood Moon.

From BBC

Sky-watchers around the world have been witnessing a striking Blood Moon - a phenomenon that happens when the Moon passes through the Earth's shadow, taking on a deep red hue.

From BBC

As it passes through Earth's shadow, it will take on a deep red hue, creating a striking "Blood Moon".

From BBC

It was a Friday night and the beach in Bournemouth was illuminated by a Blood Moon.

From BBC

For all I know, it could be the alignment of the planets — I heard they all lined up in some kind of planetary parade back a couple of weeks ago — or could it be the upcoming total lunar eclipse and “blood” moon later this week?

From Salon