The Heel Stone is a single large block of sarsen stone standing outside the entrance of the Stonehenge earthwork in Wiltshire, England. The name of the stone is derived from the Greek word for the sun – Helios. From the center of Stonehenge, the summer solstice sun rises over the Heel Stone as shown in the picture above. Many scholars believe that the summer solstice alignment could not be accidental because the sun rises in different directions at different geographical latitudes. The implication is that whoever built Stonehenge about 5,000 years ago had precise astronomical knowledge of the path of the sun. Today, the Heelstone Energy team is using the power and path of the sun to produce clean and sustainable energy.