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Sigma Pi Sigma (ΣΠΣ), founded at Davidson College on December 11, 1921, is the oldest and only American honor society for physics and astronomy. It is an organization within the Society of Physics Students and the American Institute of Physics and a member of the Association of College Honor Societies. The society's stated goals are "to honor outstanding scholarship in physics and astronomy; to encourage interest in physics and astronomy among students at all levels; to promote an attitude of service of its members towards their fellow students, colleagues, and the public; to provide a fellowship of persons who have excelled in physics and astronomy." The society has some 90,000 historical members.