Millions converge across US to see sun go dark
Millions of Americans are converging on a narrow corridor stretching from Oregon to South Carolina to watch the moon blot out the midday sun on Monday.
It will be the first total solar eclipse to sweep coast-to-coast across the US in 99 years.
With 200 million people within a day's drive of the path of totality, towns and parks are bracing for monumental crowds.
It is expected to be the most observed, most studied and most photographed eclipse ever.
Astronomers consider a full solar eclipse the grandest of cosmic spectacles.
Southern-most Illinois will see the most darkness at two minutes and 44 seconds. All of North America will get at least a partial eclipse.