This portal provides access to an extensive selection of maps, imagery, and geospatial data for the Moon, Earth, Venus, Mars, Jupiter, and other planetary bodies and moons. Some materials are available for online viewing...

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 collection of animations introduces students to planetary motions, gravitational effects, and the scale of astronomical distances. Students can view visualizations of Earth's changing seasons, circumpolar motion,...

This is a diagnostic test developed by the Collaboration for Astronomy Education Research (CAER) for astronomy teachers teaching non-science majors at the introductory level. The first twenty one questions are content...

An algebra-based overview of elementary and pre-telescope astronomy. Topics covered include sundials, seasons, calendars, precession, shape and rotation of Earth, Greek astronomy, the path to heliocentric theory and...