It’s a rare astronomical event that only happens thirteen or fourteen times every one hundred years, and the 2016 transit is the longest one of the 21st Century. These transits occur in May and November and the last three transits were in 1999, 2003 and 2006. For nearly 8 hours in the afternoon the planet Mercury comes between the Sun and the Earth and Mercury is seen as a small black dot moving across the face of the Sun.
This event can only be seen through a telescope however, you should never look at the sun directly without any aided protection such as solar filters. The Widescreen Centre sell solar film online which can be purchased for around £20 and this allows you to make your own. It can easily be done in around half an hour. https://www.widescreen-centre.co.uk/astronomy-filters-and-filter-wheels/solar-filters/baader-astrosolar-a4-nd50-safety-film
Chris Steers one of the presenters covering the transit says, “This is an extremely rare event and is the longest lasting one this century. Not many Transits of Mercury have been seen from the UK so now is the chance to have a look”.
If you love your astronomy make sure you tune into104.7fm or online via www.castledownradio.info to hear all about the Mercury transit.