A solar tracker is a device for orienting a photovoltaic panel toward the sun. The sun's position in the sky varies with the time of day as the sun moves across the sky. Solar powered equipment works best when pointed directly at the sun. 

The Education Solar Tracking System is a portable, computerized demonstration model designed to show students one technique for collecting energy from the sun. It has a 6 watt photovoltaic panel mounted on a motor controlled single axis base with the ability to move about 140 degrees. A computer controls the position of the panel as the sun moves across the sky by monitor power produced from the panel.