Observations of Mars, 1840s. Illustration of the southern (left) and northern (right) hemispheres of Mars as observed by telescope. 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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