Moon moves to make dazzling ring
Sunlight catches mountainous peaks on the lunar limb to give the ring a beaded appearance
A dark shadow is about to be thrown over much of Europe, Africa, Asia and the Middle East in an annular eclipse.
Monday will see the Moon sweep across the face of the Sun for a dazzling display of celestial mechanics.
An annular eclipse is less spectacular than a total solar eclipse because the sky never goes completely black; but it should, nonetheless, be quite a show.
In the right places, skywatchers should see a blazing ring of fire surround the Moon's disc.
Once again, though, astronomers are urging those without the proper viewing equipment not to look directly at the Sun with the naked eye; blindness could result.
In and out
In the UK, only a partial eclipse will be visible; the Moon will be seen to take a large chunk out of the Sun.
Depending on where one is standing, between 44% (Aberdeen) and 64% (Plymouth) of the Sun will be covered, according to the Society for Popular Astronomy.
In London, this partial eclipse starts at 08:48BST and ends at 11:18BST.