This brief article describes the historical methods of marking and measuring time. Among the instruments and methods discussed are sundials, water clocks, celestial motions, and mechanical clocks. Included are descriptions of the sources of inaccuracies of these methods. Links to related resources and a separate page of pedagogical notes are provided.

This is a lesson plan created by Sheryl Hunt. It is meant to guide educators to lead a meaningful discussion with students to discover and discuss how math is used in their everyday lives outside of school. After a good discussion, student will have the opportunity to create a digital story telling how math is found in their life.