In this video segment adapted from NOVA, learn about the mechanics of solar eclipses and observe the rare 1991 eclipse from the top of Mauna Kea.

Newton and Einstein had big ideas but needed an eclipse to prove them. And scientists are still pursuing secrets of the universe one eclipse at a time. [6:09]

In this episode, Phil breaks down what happens during a solar and lunar eclipse and provides tips for safely viewing a solar eclipse. Learn how the Ancient Greeks calculated a close estimation of the earth and moon's actual size two...

An explanation of how a solar eclipse forms and how telescopes are used to observe them from the Earth. [5:07]

In this episode of SciShow Kids, Jessi talks about solar eclipses, and in particular, the solar eclipse of 2015! Jessi will show you how eclipses occur and where the best places to view the eclipse are. [2:46]

A video defining how a solar eclipse occurs. Learn the difference between a total and partial solar eclipse. [2:46]

This crash course tackles the topic of eclipses. Learn about both the solar and lunar types. [10:32]

Discover how a solar eclipse happens. [2:10]

Watching an eclipse? Save your eyeballs -- rig up a sweet viewing set-up with some help from this video. [3:00]

This video answers the following questions: Why don't we have a solar eclipse every new moon (every time the Moon is between the Earth and Sun)? Why don't we have a lunar eclipse every time the Earth is between the Sun and Moon? [5:31]

A video giving some of the properties of the moon. [1:02]

Want to see a ring of fire? We'll tell you how to see Sunday's solar eclipse.

This YouTube video from Live Science demonstrates how to build your own eclipse viewer and how to use it safely to protect your eyes from the sun.