Astronomy. A combination of two solar photographs showing br - Lot 3

Lot 3
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Estimation :
400 - 600 EUR
Astronomy. A combination of two solar photographs showing br - Lot 3
Astronomy. A combination of two solar photographs showing bright areas and calcium vapor eruptions. The sun's diameter is 865,000 miles. Photographed with the spectroheliograph at the YERKES Observatory, University of Chicago. Circa 1930.
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