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Have you heard that the US is about to witness a total eclipse of the sun? Solar eclipses, when sunlight reaching earth is blocked by the moon, occur somewhere on earth about once every 18 months. But the last time a total eclipse was visible from coast to coast in the U.S. was nearly 100 years ago! To help you better understand and more fully appreciate the August 21 total eclipse, Hadley has teamed up with NASA scientists to bring expert insights right to you.