Resources to Explore
Lessons, Activities, and Information

for Observing the Earth's Daily and Seasonal Cycles

Get Oriented:

Build Understanding
The Mystery Class challenge begins at the end of January. The optional lessons below build students' understanding of Earth's daily and seasonal cycles. They also help build students' skills before Mystery Class begins in late January.

Practice Your Skills
To help narrow down the 10 secret locations, each week you will calculate and graph the changing amount of daylight at each site using their sunrise/sunset times (photoperiod). Practice these skills so you'll be ready to watch for trends:

Begin the International Investigation
Mystery Class 2007 (January 29-May 11)

Links and Supplemental Lessons

Science Math
Keep a Mystery Class Journal

North for