Stellar Spectrum, Variable Stars, 1890s

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Keywords: 1890s, 19th, absorption, america, annie, astronomy, astrophotography, astrophysics, bw, cambridge, cannon, century, classification, college, compare, contrast, draper, emission, famous, harvard, henry, history, jump, lines, memorial, observatory, photo, spectra, spectroscopic, spectrum, stars, station, stellar, usa, variable