Question

How is an astronomical unit defined?

Answer 1

Excellent Question !!!

For general reference, we can say that one astronomical unit (AU) represents the mean distance between the Earth and our Sun. An AU is approximately 93 million miles (150 million kilometre ).It's approximately 8 light minutes.

Answer 2

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Astronomical unit (AU, or au), a unit of length effectively equal to the average, or mean, distance between Earth and the Sun, defined as 149,597,870.7 km (92,955,807.3 miles).