The Physics Teacher
Timothy F. Slater
American Association of Physics Teachers
Throughout history people have used shadows and sundials to measure the passage of time. This article describes how to construct a personal sundial that can be worn as a necklace or carried as a key chain. The activity is easily adaptable for grade levels elementary through high school. The instructions can be scaled for a schoolyard project. We’ve found sundial construction to be a terrific project that not only encourages students to investigate movement of the Sun in the sky, but also allows them to practice their math skills.
Larson, Michelle B., "Constructing a Portable Sundial" (1999). All Physics Faculty Publications. Paper 17.