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Free EU, by Etienne Parizot / University of Paris / L2 / Year 2021–2022 Summary (session of September 15, 2021): • Additional information on the Moon: Earthlight Proper rotation and orbital rotation Tides and distance from the Moon • Earth-Sun distance: principle and difficulty of geometric methods • Jean-Dominique Cassini: an… astronomical life! • Heliocentrism: some historical references (very incomplete), Copernicus, Tycho Brahe, Kepler, Galileo, Newton • Dimension of the solar system: ratios of the orbital radii of the inner and outer planets