The astronomy of Milton's 'Paradise lost' Quotes

“Kepler, one of the very greatest of astronomers, and a man of remarkable genius, who was the first to discover the real nature of the paths pursued by the Earth and planets in their revolution round the Sun. After seventeen years of close observation, he announced that those bodies travelled round the Sun in elliptical or oval orbits,”
― Thomas Nathaniel Orchard, The Astronomy of Milton's 'Paradise Lost'