Countdown to Mystery Class: Five Months to Go!

Welcome to Mystery Class 2012-2013
Mystery Class is a global game of hide-and-seek. Students follow sunlight clues to find ten secret sites located around the world. As students solve the mystery, they discover the reasons for seasons.

Mystery Class begins January 28, 2013. Watch for monthly "Countdown to Mystery Class" messages to help you and your students get ready for the challenge.

Image of the Month

Follow the Sun
The Equinox is Coming!
Image: A Clevenger

How Can I Prepare Students? Track Changes in Day Length

Begin recording daily sunrise and sunset times. As students examine the sunrise/sunset data, have them calculate changes in photoperiod.

Report your photoperiod twice this month:

  • Look up your data for September 1 and 23.
  • Report data (select "daylight").
  • View data on photoperiod map.

Observe and wonder:

  • What changes in day length do students notice?
  • How do they explain the changes they see?

Students' explanations will reveal what they know—and are ready to discover—about the relationship between sunlight and seasonal change.

Report to the Map!

Photoperiod is the length of time between sunrise and sunset.


Just for Teachers: Practice Packets #1 and #2

These printer-friendly Practice Packets are designed to help you prepare:

Practice Packet #1
Exploring Latitude Clues
Practice Packet #2
Exploring Longitude Clues
Exploring Latitude CluesNext January 28th, your students and the 10 Mystery Class locations will begin to record weekly sunrise/sunset data. The data will slowly reveal information about the latitude of the 10 secret sites... Exploring Longitude CluesNext March, as the spring equinox approaches, students will begin to explore information that will help them estimate where Mystery Classes are located east and west of the Prime Meridian...
The Next Countdown to Mystery Class will be posted October 1, 2012.