A novel, spherical shaped sun tracker

A novel, spherical shaped sun tracker, capable of shifting the centre of gravity, has been built at the Faculty of Energy and Fuels at AGH-UST. First tilting tests were executed and the results of these measurements have been presented herein. To introduce the reader to the authors' concept of sun tracking, a revive of the recent literature concerning tracking has been mechanisms has been conducted and some interesting ideas as well operating prototypes have been described.