Millions of people could witness the best solar eclipse in years seen from the UK and northern Europe later.
A path across the Earth's surface will be plunged into darkness as the Moon covers up the Sun.
The event's geometry means that in the UK the Sun will be between 83% and 98% covered, from about 09:23 GMT onwards. The weather will determine visibility.
Experts are warning people not to look directly at the Sun because it could cause serious harm.
The deep shadow forms first in the North Atlantic, before sweeping up into the Arctic Circle and ending at the North Pole.
The UK will not see a solar eclipse on this scale again until 2026, but the British forecast is not particularly encouraging.
Nonetheless, all parts of the UK are in line to see at least 83% of the Sun's disc obscured by the Moon.