Make sure you are wrapped up warm and outside looking at the sky tomorrow evening... There will be a total eclipse of the moon - and it is set to be the "best in years" according to the BBC website...
At "totality", the moon will be in the earth's shadow, and so only sunlight that has been filtered through the earth's atmosphere will reach the moon - making the moon appear reddish in colour.
This particular eclipse will be unusal, because it will be at least partly visible from every continent.
Click on the picture to find out more... And don't forget to post a comment telling us what you saw! If you manage to take any pictures, you can email them to firstname.lastname@example.org