This unit introduces students to some general concepts of astronomy. Topics include geocentric versus heliocentric theories of the solar system and how they explain the sun's movements, sidereal days versus solar days,...

This web page from the Exploratorium presents a hands-on activity for safely observing a solar eclipse with a pinhole viewer. The project uses everyday supplies: long box, a piece of aluminum foil, a pin, and a sheet of...

Solar Week is a week of online curriculum with daily topics on the Sun, including Sun as a Star, the Sun Close Up, Solar Activity, Eclipses, and Careers. Each day contains a game, an activity, topical questions, a...

Solar eclipses result from the alignment of the Sun, Moon, and Earth. Total solar eclipses, in which the Sun is completely blocked by the Moon, are a spectacular and rare sight to witness. This animation, adapted from a...

The Universe Forum is the national center for teaching and learning about the structure and evolution of the universe. Sponsored by NASA and based at the Harvard-Smithsonian Center for Astrophysics, the Forum uses the...