On the 11 November, 2019 a transit of Mercury will be observed for several hours across most of the globe with the exception of most of Asia and Australasia. Observers in North America, South America, Africa and Europe will be able to witness the majority of the transit as the planet slowly traverses the Sun’s disc.
Eastern parts of Central North America, the whole of South America and a small section of far western Africa will be able witness the whole even from start to finish .
How rare is a transit of Mercury?
With only approximately 13 transits of Mercury each century, these are relatively rare events. The last transit of Mercury occurred in 2016. Only two planets in the solar system can transit the Sun as viewed from Earth, the two planets with orbits inside the Earth’s. Namely Mercury and Venus.
Transits of Venus are even rarer occurring in pairs usually more then a century in time between the pairs. The last pair being 2004 and 2012.