Total lunar eclipses turn the moon red when the Earth passes between the Sun and the moon and casts a shadow on it. When the white light from the Sun hits the Earth's atmosphere, which is full of nitrogen, the blue colours in the white are scattered, meaning only the red colours will hit the moon giving it an eerie tint. The UK falls slightly outside of the ideal viewing range, meaning people will see the total eclipse for only 84 minutes of the total time.
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