There are a few things happening tomorrow. It's the Winter Solstice and it's also a total lunar eclipse. The eclipse starts at 6:30 am GMT and is visible from the UK. I'm not sure how good it will look from other parts of the globe but I think Eastern parts of North America might get a good view. In fact, I'm a little late with this because Americans will see it in the early hours of the 21st.
Here, the moon will be setting as it goes into eclipse and the sun will be just starting to rise. The last time this happened was in 1638. The years following it saw the English civil war, the Great Plague, the Witchfinders, the beheading of King Charles and finished with the Great Fire of London in 1666. So it wasn't a good omen, really. Fortunately we don't currently have a King Charles, so let's hope the Queen is in extraordinarily good health.
I hope to see the eclipse, but it's full cloud cover at the moment. It doesn't look promising.