The partial eclipse in Colorado occurred during a rare annular solar eclipse, in which the moon passed in front of — but did not completely obscure — the sun. In parts of China, Japan and eight western states, the celestial show created a dazzling "ring of fire" effect, while wide swathes of the U.S., including Colorado, saw a partial solar eclipse.

But even a partial eclipse was enough to draw a crowd of thousands to Folsom Field to see the moon take a bite from the sun. The organizers had billed the event as the world's largest solar eclipse viewing party.