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The moon is approximately 385,000 km from Earth. What is this distance in astronomical units?
2.57 E-03 = 0.00257 AU, nearly.
Indian Astronomical Union (IAU) AU = 149597870.7 km.
So, Earth-Moon distance in AU is
385000/149597871
= 2.57 E-03m rounded to 3-sd, on par with 3-sd approximation in Earth-Moon distance..