On February 12, 1831, an annular solar eclipse was seen in Virginia. Nat Turner saw this as a black man’s hand reaching over the sun, and he took this vision as his sign.  On August 13, there was another solar eclipse, in which the sun appeared bluish-green.  Turner took this occasion as the final signal, and a week later, on August 21, he began the most notable slave rebellion on US soil.

Next solar eclipse visible from the United States:  August 21, 2017 Sweeping a 70-mile-wide path across the United States, moving across Oregon, Idaho, Wyoming, Nebraska, Missouri, Illinois, Kentucky, Tennessee, North Carolina, and South Carolina.

“The time was fast approaching when the first should be last and the last should be first… And by signs in the heavens that it would make known to me when I should commence the great work, and until the first sign appeared I should conceal it from the knowledge of men; and on the appearance of the sign… I should arise and prepare myself and slay my enemies with their own weapons.” – Nat Turner

Just an fyi