The Celts were the protagonists of life in the Iron Age in Europe. The testimonies of their cults and their astronomical knowledge are still handed down to us through their stone works: the Barec. In Italy in the upper Brembana Valley, astronomical correspondences have been found between these stone circles and the celestial phenomena that characterized the life of the Orobic tribes in the 5th century BC. Professor Gaspani with techniques of satellite archaeoastronomy has been able to date the frequentations of the Barec of the Plans of Mount Avaro (Bergamo) by the Alpine Celtic populations, helping with unique archaeological finds such as inscriptions in Leponzio alphabet likely devotes to the Celtic god Pen of the peaks and valleys, of the menhirs of The Camisana Valley (Bergamo), of the images of the Man of the Woods perhaps "domesticated" depictions of the Celtic God Chernunnos. A book for fans of archaeoastronomy and history of the Celtic people.