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Eratosthenes (276-194 BC) was a Greek mathematician, geographer and astronomer. He was born in Cyrene, Libya, and lived in Alexandria, Egypt, where King Ptolemy III appointed him head of the Library of Alexandria. His most celebrated scientific achievement was the measurement of the circumference of..
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Glaciers play a major role in the climate system and the hydrological cycle. 68% of fresh water is trapped in snow, ice and glaciers, which together make up the Earth’s cryosphere. Global warming has led to melting and retreat of glaciers, which amass 2% of the Earth’s water, and rapid shrinking of ..
€99.00
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Ptolemy’s astrolabe (or spherical astrolabe) was an ingenuous astronomical instrument of antiquity. It simulated the celestial sphere and its revolution. Unlike solid celestial globes marking the positions of the major stars and constellations, it is an armillary sphere: the principal celestial circ..
€145.00
Ex Tax:€145.00
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