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  Countdown to Mystery Class: Get ready for Mystery Class by tracking changes in day length as the Earth revolves around the Sun. More. . .


How to Participate
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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