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Used as early as the third century BCE, armillary spheres are astronomical models of the celestial sphere—an imaginary sphere surrounding the Earth, upon which the celestial bodies seem to lie. Fixed and movable rings representing circles of the celestial sphere, such as the ecliptic and the celestial equator, allow astronomers to use armillary spheres to determine the movements and positions of stars. A representation of this device is prominently featured on what country’s national flag? Discuss
Source: The Free Dictionary