There's a total lunar eclipse tonight, December 20, when the moon will turn blood red - if there's a clear sky.
A lunar eclipse happens when the Earth blocks all the sun's rays from hitting the moon. The last full moon eclipse was three years ago.
If you want to track it and find out exactly when you can see the blood moon, there's an app for the iPhone and iPad that will tell you...and the developer has cut its price to free for the eclipse.
You can find SkySafari lite in the Apple App Store.
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