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...

This web page contains an activity to track the position of the sun at different times during the year. Participants create their own sundials and mark the location of the sun’s shadow over a period of time. An...

Authored by Jurgen Geisen, this site has more than sixty-five Java applets. The interactive resources provide detailed solar and lunar data and the daily and annual path of the sun and moon for any location. More...

This site provides eleven lesson plans for kids from ages five to seventeen that teach about astronomy and the principles underlying astronomical sciences. Provided by the McDonald Observatory at the University of Texas,...

These web pages, authored and curated by David P. Stern, provide a short overview of the common (Gregorian) calendar and some less-common ones--Julian, Jewish (leap months), Moslem, Persian (New Year on the spring...