Khan Academy
Khan Academy: Seasons Aren't Dictated by Closeness to the Sun
This session illustrates that the distance from the sun does not determine the season for the Earth. [4:39]
Khan Academy
Khan Academy: Earth's Tilt 1: The Reason for the Seasons
A video spelling out the scientific reason for the four seasons. Understand why it is summer in the United States at the same time Australia is experiencing winter. [5:38]
Khan Academy
Khan Academy: Measurement: Earth's Tilt 1: The Reason for the Seasons
How can it be summer in North America and winter in Australia at the same time?! Discover the reason for the seasons. [5:39]
Learning Junction
Learning Junction: Seasons in Earth
In this video, the season are defined as "four divisions of the year marked by particular weather patterns n daylight hours, resulting from the earth's changing position with regard to the sun."
Other
Brad Freese: Earth's Tilt and the Seasons
This brief animation will help clarify how the tilt of Earth's axis causes the change of seasons. [0:34]