retrofutureground: Yerkes Observatory, 1918 Solar Eclipse Expedition. 1. “Heliosaurus” prominence on the western limb. Photographed on the Yerkes Observatory expedition to Wyoming and Colorado to record the total solar eclipse of June 8, 1918. 2.
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retrofutureground: Yerkes Observatory, 1918 Solar Eclipse Expedition. 1. “Heliosaurus” prominence on the western limb. Photographed on the Yerkes Observatory expedition to Wyoming and Colorado to record the total solar eclipse of June 8, 1918. 2.
