Timeline October 1604

Events in October 1604 1

• 1604 Observes the supernova of 1604 Studies "Kepler's Supernova" When a bright new star appeared in the sky in October 1604, Galileo observed it closely and used the absence of measurable parallax to argue it lay far beyond the Moon, among the fixed stars. This directly contradicted the Aristotelian view that the heavens beyond the Moon were fixed and unchanging. His public lectures on the supernova increased his reputation and sharpened his willingness to challenge established cosmology.