Samuel Pierpont Langley
Frederick Atwood Greeley (26 November 1896 in Pelham, New Hampshire – 19 March 1980 in Laguna Hills, California) was an American astronomer who worked on the solar constant program of the Smithsonian Astrophysical Observatory (SAO), which had been started by Samuel Pierpont Langley. Greeley was a second cousin of Charles Greeley Abbot.