Get Ready for Mystery Class 2020
  Mystery Class starts January 27, 2020. Get ready this fall by tracking changes in day length as the Earth revolves around the Sun. More...
News

About

How to Participate
Calendar
Teachers
Report
Map
Mystery Class Photoperiod Map
 
Reasons for Seasons: Model

Revolving Earth

 

Mystery Class is a global game of hide-and-seek. Follow photoperiod clues to search for ten secret sites around the world. Track sunlight to solve a mystery—and discover the reasons for seasons along the way.