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Track changes in day length as the Earth revolves around the Sun. More...
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Mystery Class Photoperiod Map
 
Reasons for Seasons: Model
Track the Seasons to Solve a Mystery
 

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.

 

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