On the 11 November, 2019 stargazers around the world will get the chance to observe a rare transit of Mercury. The innermost of the rocky planets will cross the Sun’s disc for a period of around five and a half hours. The event will be visible across most of the globe with the exception of Oceania and large areas of Asia. Observers in North America, South America, Africa and Europe will be able to witness the majority of the transit.