A league is the distance a person can walk in an hour - often defined as 3 miles, or as 5 kilometers.
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1 centimeter = 1.0 × 10-5 kilometers, or 0.00001 kilometers.
0.000001 kilometers
1 Astronomical Unit = 149,598,000 kilometers
1 league = 5556 meters
4000 miles (1.609 kilometers/1 mile) = 6436 kilometers