Today, millions of Americans will have the opportunity to see a rare total solar eclipse.Fred Espenak, a retired astrophysicist known as Mr. Eclipse, was so blown away by an eclipse he saw as a teenager that he dedicated his life to traveling the world and seeing as many as he could.Mr. Espenak discusses the eclipses that have punctuated and defined the most important moments in his life, and explains why these celestial phenomena are such a wonder to experience.Guest: Fred Espenak, a.k.a. “Mr. Eclipse,” a former NASA astrophysicist and lifelong eclipse chaser.Background reading: A total solar eclipse is coming. Here’s what you need to know.Millions of people making plans to be in the path of the solar eclipse on Monday know it will be awe-inspiring. What is that feeling?The eclipse that ended a war and shook the gods forever.For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday.