It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
Winter (December 20 or 21)
This guide has resources about winter weather, science and animal adaptations.
Learn more about the shortest and longest days of the year. The image in the article has a link to additional information about the Incan Festival of the Sun.
This is a 12-minute video explaining the sun's arc through the sky at different points in the year, including the solstice and equinox. (for older elementary or secondary students)
This video explains how the shape of the Earth's orbit around the Sun and the Earth's tilt on its axis affect the amount of sunlight we get in winter and summer. Learn about Kepler's discoveries and how they explain the seasons.
Explore what causes seasons on Earth in this interactive adapted from NASA materials. Click on the points on Earth's orbit around the Sun to learn about that time of year.
