Druids were thought to have knowledge of the 'Otherworld', as they read signs sent by the gods and interpreted their meaning for the tribe. This included reading the plant life that grew on the sacred oak tree and interpreting the movements of the stars and planets. As druidic doctrine was passed along verbally we may never have known the extent of their knowledge and understanding of astronomy if it had not been for Caesar, who in his chronicles wrote that “They also hold long discussions about the heavenly bodies and their movements, the size of the universe and of the earth, the physical constitutions of the world and the powers and properties of the gods”.
