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Where To Watch The Transit Of Mercury

It's happening on Monday, and you don't even have to leave your computer to see it.

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It sounds a bit Doctor Who, but the concept is actually simple: From our perspective, Mercury will travel in front of the sun.

The picture above shows a time lapse of the last time it happened, in 2006. That tiny dot going across the sun is Mercury.

Most places in the world (including Europe, Asia, Africa, North America, South America, the Pacific, the Atlantic, the Indian Ocean, the Arctic, and Antarctica) will be able to see at least some of the transit. In the UK, we'll be able to see the whole thing!


Because Mercury is so small, you'll need a telescope (with a solar filter) to be able to see it. But luckily, astronomical societies across the UK will be hosting events for people to watch.

By Brocken Inaglory - Own work, GFDL,

If you're in London, the Royal Observatory, Greenwich, is putting on a whole day of events for the spectacle, and you'll of course be able to view the transit (for free next to their Astronomy Centre, or for £5 if you want a timed ticket to see it through the Great Equatorial Telescope).

Check the Federation of Astronomical Societies' website to find your local astronomical society and contact them to find out if they're hosting a viewing.

But if you're stuck in the office, or the sky clouds over, don't despair. You can also watch the transit online.

ESA will have a live stream of the event. Check here for a link on Monday.

The Slooh Community Observatory will also be live-streaming here.

This NASA page will be updated throughout the day with images from its Solar Dynamics Observatory. NASA TV will broadcast an hour-long special between 3:30pm and 4:30pm UK time.

And if you miss this one, you're in luck. Though they don't usually come this often, the next transit of Mercury is in just three years: Mark your calendar for 11 November 2019.