What's being described as the biggest astronomical event of the decade is finally happening today.
The total solar eclipse – when the moon completely blocks the face of the sun – is taking place in the early afternoon of April 8.
Briefly turning the outdoors dark in daytime, the spectacle will be visible for an estimated 32 million people along a narrow strip of North and Central America.
Although the total solar eclipse won't be visible in the UK, nine towns and cities in Britain and Ireland are set to get a glimpse of a 'partial' solar eclipse.