In "Obsession," Charlie has a photograph that shows a basketball hoop and its shadow from the sun. He then uses trigonometry to determine the sun's angle of elevation. Knowing the sun's elevation and the time of day, Charlie could then figure out where the photograph was taken.
Before the Activity
Download the attached PDF and look over the Teacher page.
During the Activity
Discuss the materials from the Student Page with your class.
After the Activity
Encourage students to explore web sites and questions from the Extensions page.