Welcome to Mystery Class 2019*
 

Feb. 18: This week, explore time zones to get ready for special time clues coming in March. 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.

* Please note: Due to budget limitations, our spring 2019 Mystery Class challenge is a replay of a previous year's challenge. We will reveal the locations of the 10 Mystery sites on Monday, April 15th but will not hold a year-end contest.