Solar eclipse 2017: What time and where is it, plus the science behind it

Today, all of North America will witness a total solar eclipse for the first time in 99 years, where the Moon will pass in front of the Sun, casting darkness across swathes of the Earth's surface - with up to 14 states shrouded in complete blackout. What's happening? Dubbed the Great American Eclipse, the spectacular moment will see the Sun, the Moon and the Earth become perfectly aligned in a once-in-a-lifetime celestial spectacle seen from the Pacific Ocean to the Atla