FROST, EDWIN BRANT (1866-1935), American astron omer, was born in Brattleboro, Vt., on July 14, 1866, and gradu ated at Dartmouth college in i886. From 1887 to 1890 he served at Dartmouth as instructor in physics and astronomy and re ceived his M.A. degree in 1889. The following year he studied in Strassburg, Germany, and in 1891-92 served as volunteer and assistant in astrophysics at the observatory at Potsdam. He was assistant professor of astronomy and director of the observatory at Dartmouth, 1892-95, and professor, 1895-1902. In 1898 he became professor of astrophysics at the University of Chicago and astrophysicist at the Yerkes observatory, Williams Bay, Wis., of which in 1905 he was made director. He became editor of the Astrophysics Journal in 1902 and was also editor of the publica tions of Yerkes observatory, in which much of his scientific work has been printed. His chief contributions have been in the field of stellar spectroscopy, especially the spectrographic determina tion of velocities of stars. He also made researches on sun spots and the thermal radiation of the sun. He edited A Photographic Atlas of Selected Regions of the Milky Way (1927).