define one astronomical unit
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Explanation:
The astronomical unit is a unit of length, roughly the distance from Earth to the Sun and equal to about 150 million kilometres or ~8 light minutes. The actual distance varies by about 3% as Earth orbits the Sun, from a maximum to a minimum and back again once each year.
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a unit of measurement equal to 149.6 million kilometres, the mean distance from the centre of the earth to the centre of the sun.
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