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1802 - 1860:
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Fraunhofer lines -
Dark lines in the sun's spectrum discovered
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1851 - 1895:
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Helium -
Discovered in the Sun before on Earth
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1896 - 1913:
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Proto-Hydrogen -
Helium mistaken for Hydrogen in some stars
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1840 - 1928:
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Nebulium -
Spectroscopy of nebulae by Huggins
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- 1930:
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Auroral lines -
Spectral lines from Earth's aurora
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1866 - 1929:
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P Cygni lines -
novae with blue shifted lines
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1867 - 1933:
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Wolf-Rayet spectra -
Broad band emission lines
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1869 - 1939:
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Coronium -
Emission lines during solar eclipses in corona
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1866 - 1942:
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Shell Stars -
Stars having broad emission lines
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1899 - 1946:
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The Balmer Jump -
Hydrogen line jump in Vega-like stars
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