Retired astrophysicist Fred Espenak has been observing the moon for about 60 years. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.

We can thank people like Fred Espenak, also known as Mr. Eclipse, for working out the science and the math to tell us exactly when and where this month’s solar eclipse can be seen.

Retired NASA astrophysicist Fred Espenak, also known as "Mr. Eclipse" of Portal, Ariz., took the photo that shows a total solar eclipse seen from Jalu, Libya, on March 29, 2006.

Espenak: To see this thing in the sky, the closest thing I can compare it to is it seems supernatural. Rosin: This is Fred Espenak. He’s a retired astrophysicist and, of course, an eclipse chaser.

Fred Espenak is the type of person who doesn't wait for a total eclipse to come to him. For nearly 50 years, he's traveled to every continent -- even Antarctica -- to witness the natural wonder he ...

Fred Espenak, a retired NASA scientist who is responsible for the calculations of future solar and lunar eclipses around the world.

Astrophysicist and eclipse expert Fred Espenak, also known as Mr. Eclipse, has traveled the world observing and photographing solar and lunar eclipses. He's currently gearing up for the Aug. 21 ...

Astrophysicist and eclipse expert Fred Espenak, also known as Mr. Eclipse, has traveled the world observing and photographing solar and lunar eclipses. He's currently gearing up for the Aug. 21 ...

Audie Cornish speaks with Fred Espenak, scientist emeritus at NASA Goddard, also known as "Mr. Eclipse," about the lunar eclipse that will happen Monday night. It's must-see astronomy tonight ...

Retired astrophysicist Fred Espenak, known as “Mr. Eclipse” for his work on eclipse predictions, will speak Friday night at the University of Missouri-Kansas City about the upcoming total eclipse.

Astrophysicist and eclipse expert Fred Espenak, also known as Mr. Eclipse, has traveled the world observing and photographing solar and lunar eclipses. He's currently gearing up for the Aug. 21 ...