The Vernal Equinox is coming! Only on the equinox, locations at the same longitude experience sunrise at the same time. Next week's Time Clues will help you estimate the longitude of the Mystery sites.More. . .
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.