DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Map of the Moon, by Johann Doppelmayr (1671- 1750). This early engraving of the Moon by the German mathematician and astronomer Doppelmayer is thought to date from 1730. It depicts the Moon as two hemispheres, each showing the front from a different view. The left shows the system developed by Polish astronomer Johannes Hevelius (1611-1687), which conceived of a correspondence between geographical features on the Earth and the Moon. The right shows the system developed by Giovanni Riccioli (1598-1671), which had features named after famous people. These systems competed for over a century, but it is Riccioli's which has now gained wider acceptance. The chart is titled Tabula Selenographica.
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