Short explanation of the winter solstice, with a diagram. Available in three versions, Elementary, Intermediate, and Advanced. There is also a tab that accesses a Spanish-language version.

An article about how the winter solstice is celebrated in China.

Very nice website with excellent graphics depicting the change of the seasons and how the seasons are different between the northern and southern hemisphere. Also has a nice informational table of the spring and fall equinox and summer...

After listening to excerpts from four of the violin concertos from "The Four Seasons" by Italian composer and violinist, Antonio Vivaldi, decide which excerpt was meant to go with which season, and also decide where the earth would be in...

This Montana State University site provides a simple chart on the spring and fall equinox and a description of the process.

Students will collect, record, and graph the sunrise and sunset times to see how they change throughout the year.

History and mathematics merge in this lesson that explores the origin of the calendar. Learn how it all got started in this detailed lesson that includes a simple months of the year game and a more challenging time conversion game. Both...