This site from the encyclopedia Wikipedia describes both the Autumn, or Fall, season as well as the reason for the season. Links are provided to information about the equinox and solstice associated with the season as well as a link to...

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...

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

The concept of a year in time and the various kinds of year used in human timekeeping are discussed.

This website gives very detailed information about all aspects of the Chinese calendar.

This website gives very detailed information about all aspects of the Christian (Julian) calendar.

Find out what all results from Earth revolving around the sun every 365 days as well as the rotation of the Earth every 24 hours.

Site from NASA contains a collection of 91 questions pertaining to the Earth's atmosphere, magnetic field, ionosphere, rotation and origin of life.

Learn about the four seasons, when they occur in the northern and southern hemispheres, and why the seasons change as the Earth rotates around the Sun.

A brief explanation of the Earth's rotation around the Sun and how it relates to the amount of sunlight the Earth receives, and to the seasons. Includes two questions for students to respond to.

Provides interesting facts about the Tropics of Cancer and Capricorn and why they are important.