Abstract
As a world, Mars greatly resembles the Earth, and this is why we are so interested in it—perhaps to a greater degree than with any other planet. On the other hand, the differences are great enough to avoid monotony, and in this respect their study is highly significant. The question of the changes which take place unceasingly on the surface poses some of the most curious problems of contemporary astronomy. This is been recognized ever since the year 1876.
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The view of each observer plays a major role. For example, I can easily read the minutes on my watch dial, though I am somewhat myopic, but cannot easily distinguish objects which are far away. Other eyes are quite different. The best double-star observer that we have, S. W. Burnham, has discovered many pairs separated by less than a second of arc, but has never been able to see the nebulosity in the Pleiades, etc.
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Sheehan, W. (2015). Changes Actually Observed on the Surface of Mars. In: Sheehan, W. (eds) Camille Flammarion's The Planet Mars. Astrophysics and Space Science Library, vol 409. Springer, Cham. https://doi.org/10.1007/978-3-319-09641-4_10
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DOI: https://doi.org/10.1007/978-3-319-09641-4_10
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