The path of totality of the August 21, 2017, solar eclipse, will sweep across the United States from coast to coast for the first time in 99 years, since 1918. Astronomer Jay Pasachoff is leading an international team of astronomers in preparing scientific observations to study the sun’s outer layer, the solar corona, and also the effect of the eclipse on the Earth’s atmosphere. He is also coordinating visiting astronomers from around the globe, giving reciprocity for their hospitality in decades of past eclipse expeditions. At the American Physical Society meeting, Pasachoff is presenting a paper about scientific observations of solar eclipses and their potential consequences for astrophysics.