On August 21 of this year, Casper will be part of a global event with a full solar eclipse. This video from NASA shows the path of the eclipse as it passes over the country. It goes into details of when it will peak and over which parts of the U.S. Plus it shows the irregular shape of the moon's shadow. The moon has its own peaks and valleys (it is not a perfect globe.) The narration explains how the created this detailed animation.