Charlotte Moore Sitterly and her husband enjoyed gardening, music, and traveling together until his death in 1977. Although Dr. Bancroft Sitterly's career was somewhat overshadowed by that of his illustrious wife, he also had been an accomplished physicist and educator. For many years he had held the position of chair of the physics department at American University in Washington, D.C. Throughout her life, Charlotte maintained close ties to her family and to the Society of Friends. In 1982 she researched and published a genealogy of her mother's family.
Charlotte Moore Sitterly had a long and illustrious career as an astronomer and astrophysicist. When spectroscopic data began to become available from instruments carried above the earth's atmosphere, she was immediately sent prints and began work on ranges of the spectra that had previously not been analyzed. She continued to work well past her mandatory retirement at the age of 70 until her death on March 3, 1990. She died in her home in Washington, D.C., of heart failure at the age of 91.
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-----. "Collaboration with Henry Norris Russell over the Years," in In Memory