Online Resources for Teaching Astronomy

The Internet has transformed the teaching of astronomy. In the past, instructors were mostly reliant on printed textbooks, 35-mm slides, and their own lecture notes. Depending on local resources they might also be able to incorporate labs, hands-on activities, and use of small telescopes. Now they can choose from a wide, and occasionally bewildering, array of online resources to augment what they do in the classroom. A challenge is to find tools that are either evaluated in peer-reviewed publications or have proven their efficacy in other ways. A selective list is provided.