523 Specific celestial bodies and phenomena
523.7 Sun
523.7021 Tabulated and related materials 523.70284 Heliographs--astronomy 523.71 Constants and dimensions 523.72 Optical, electromagnetic, radioactive, thermal phenomena 523.73 Motions 523.74 Photosphere 523.75 Chromosphere and corona 523.76 Solar interior 523.78 Eclipses
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