Planet Venus is set to move across the face of the Sun as viewed from Earth.
The more than six-and-a-half-hour transit, which starts just after 22:00 GMT (23:00 BST) on Tuesday is a very rare astronomical phenomenon that will not be witnessed again until 2117.
Observers will position themselves in northwest America, the Pacific, and East Asia to catch the whole event.
But some part of the spectacle will be visible across a much broader swathe of Earth's surface, weather permitting.
Skywatchers in UK, for example, will catch the end of the transit at sunrise on Wednesday.
Venus will appear as a tiny black disc against our star, but no-one should look for it without the proper equipment.
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