The AU - based on the distance between Earth and the sun - has long been in use by astronomers, and the decision by the International Astronomical Union (IAU) simply ...
Appearances aside, the stars are not eternal and the planets do not move with clockwork precision. For these reasons, one astronomer is proposing that his colleagues ditch the astronomical unit, or AU ...
If you guessed the astronomical unit, you are correct. The au — the rough distance between the Earth and the Sun — was previously determined by a confusing calculation (“the radius of an unperturbed ...
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