The Mongols, a tribe of Nomads from Central or North Asia, who were ruled by Genghis Khan at the time.
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Answer:
The celestial sphere is a fictional sphere to which all celestial objects can be projected.
Explanation:
At any time an observer can see only the half of celestial sphere because the other half lies under the horizon. The celestial sphere is the medium used for sphere astronomy. The celestial sphere does not have a defined magnitude. It can be infinite or at least really big.
Weathering is the correct answer
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