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ETH-BIBLIOTHEK ZÜRICH / SCIENCE PHOTO LIBRARY ETH-BIBLIOTHEK ZÜRICH / SCIENCE PHOTO LIBRARY
Observations of Mars and Jupiter, 1840s. Illustration of the southern (left) and northern (right) hemispheres of Mars as observed by telescope, with observations of Jupiter across bottom. This page is from 'Beitrage zur physischen Kenntniss der himmlischen Korper im Sonnensysteme' (Contributions to the physical knowledge of the heavenly bodies in the solar system, 1841) by German astronomers Wilhelm Beer (1797-1850) and Johann Heinrich von Madler (1794-1874).
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