Ever wonder why the northern and summer hemispheres have opposite seasons? Or why the longest day of the year is considered the start of summer?
For elementary students, Enchanted Learning defines the terms solstice and equinox, and explains why we have four seasons.
With illustrations and animations, this online exhibit from the Liverpool Museums explains how the tilt of the Earth's axis causes the Earth's four seasons, and how a sundial works.
"The Earth spins on a tilted axis about once every 24 hours to create what we know as day and night. This axis is an invisible line through the center of the Earth."
For high school and college students, retired NASA physicist David Stern explains the earth's orbit around the sun, why we have seasons, and answers lots of related questions.
It is a common misconception that the seasons are caused by the Earth's changing distance to the sun, as it travels in an elliptical orbit around it.
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