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Astronomical unit now a static value

Astronomical unit now a static value
September 24, 2012, 08:55:04 PM
Under the new definition, the astronomical unit (or AU) the measurement used for the Earth-sun distance is no longer always in flux, depending on the length of a day and other changing factors. It is now a fixed number: 149,597,870,700 meters, which is the equivalent of almost 92.956 million miles.


Basically: light years or parsecs for interstellar distances, AUs for interplanetary distances, and the more familiar measurements are for local scale.