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Jupiter. Sketches by the French-Italian astronomer Giovanni Cassini (1625-1712) of the planet Jupiter, showing its Great Red Spot (upper centre of each image). In both images, North is at bottom. The left sketch was made in January 1672, and the right one in July 1677. The Great Red Spot is thought to be an enormous storm system, larger than the Earth. These sketches were published in Libert's Le Monde de Jupiter (1903).
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