Shape of the World. The first High-Tech Superpower Rivalries. The Impulse Toward Exploration. Tantalizingly brief gap between several medieval events and the European Age of Exploration China closed itself to outsiders in 1368 China's great voyages to Asia and Africa ended in 1431
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The first High-Tech Superpower Rivalries
Too rare for most purposes
Eclipses of Jupiter’s moons: frequent but hard to observe
Method never panned outAstronomical Methods