OK, it's been 99 years. But it's not the first time an eclipse has happened over the country, and in the past, the disappearing sun stirred up an array of reactions and superstitions.

David Baron is the author of "American Eclipse: A Nation's Epic Race To Catch The Shadow Of The Moon And Win The Glory Of The World." 

His book looks back on how Americans have received eclipses in the past, particularly a pivotal one in 1878. His obsession with eclipses started when he saw his first total one in Aruba 19 years ago. In his book, he details the celestial event and the spirituality it invokes in many.

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