Mystery Class starts January 25, 2019*
  Get ready by tracking changes in day length as the Earth revolves around the Sun. More...
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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.

* Please note: Due to budget limitations, our spring 2019 Mystery Class challenge will be a replay of a previous year's challenge. We will reveal the locations of the 10 Mystery sites on April 12th but will not be able to hold a year-end contest.