Days are getting shorter in the Northern Hemisphere as winter approaches. This month, begin to explore the question: What makes seasons?

Mystery Class begins January 28, 2013. Watch for monthly "Countdown to Mystery Class" messages to help you and your students get ready for the challenge.

Seasons
Image: The Living Earth®

Report your November 1st photoperiod:

• Look up your data for November 1.
• Report data (select "daylight").
• View data on photoperiod map.

Observe, Wonder, and Predict
Observe images of the Earth from space. See how sunlight strikes the Earth over the course of a year. Use the slideshow and activities to explore the 12-month cycle of changes.

• Slideshow: What Makes Seasons?

• How to Participate: Step-by-step Guide
• Practice Packet #1: Latitude Clues
• Practice Packet #2: Longitude Clues