An astronomical unit (AU) is the mean distance from Earth to Sun, approximately 150 million km.
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149,597,870 km (approximately)
1 AU is approximately 149,597,870km
The kilometer is a unit of distance, while the knot is a unit of speed. While there is no direct comparison, kilometers per hour could instead be compared with a knot (nautical mile per hour). One nautical mile is 1.151 miles or 1.852 kilometers, so 1 knot is equal to 1.852 kilometers per hour. A knot is a unit of speed, not of distance. A kilometer is a unit of distance.
A Hectare is a unit for measuring area, not distances. 1 Hectare = 10,000 Square Meters.
A mile is a unit of distance, approximately 1.6 kilometers.