Columbia subject headings:
Astrophysics.
Smithsonian Astrophysical Observatory.
Solar radiation.
Spectrum, Solar.
Harvard subject headings:
Astrophysics
Smithsonian Astrophysical Observatory.
Solar radiation
Spectrum, Solar.
Princeton subject headings:
Astronomy.
Astrophysics.
Smithsonian Astrophysical Observatory.
Solar radiation.
Spectrum, Solar.
Sunshine.