A solar eclipse is set to take place tonight, on the 12th of August, as the UK expects to experience its biggest partial eclipse since 1999, and other parts of Europe are expecting to have a total eclipse.
A solar eclipse occurs when the Earth, Moon, and Sun align or almost align. To our eyes, it looks like the Moon is blotting out the Sun, and in cases of complete or near-complete coverage, it can make it look like the world has suddenly gone dark. The eclipse is set to first arrive in Russia tonight, but by around 19:00 BST/20:00 CEST it'll have its widest coverage across Europe (via BBC News). Those in the US and Canada aren't expected to get as much coverage during the eclipse, but parts of Spain, Portugal, and Iceland will see 100% coverage.
Over in the UK, 90% is what most of us can hope to see, but the further West you are the more coverage you'll get. In Copenhagen, the coverage will be around 83%, and the same's true for Oslo and other parts of the Scandinavian region.
