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Ewald summation, named after Paul Peter Ewald, is a method for computing the interaction energies of periodic systems (e.g. crystals), particularly electrostatic energies.
Chemical Galaxy is a new representation by Philip Stewart of the periodic system of the elements, better known in tabular form as the periodic table, based on the cyclical nature of characteristics of the chemical elements (which depend principally on the valence electrons).
His love of both chemistry and astronomy led him in 2004 to publish a new representation of the periodic system of the elements - Chemical Galaxy.