Episode two of the series delves further into ancient understanding of the skies. Featuring throughout the episode are incredible CG models, footage and fascinating insights from leading scientists and historians. After exploring the stories of the gods and monsters who exist at the edge of the ‘flat earth’, we look at the widespread belief in astrology, the spread of astronomical knowledge and then discover how the revolutionary ideas of Ptolemy, Copernicus and Galileo once again reshape our ancient skies.