+The Astronomical Unit (AU) is a fundamental [unit of length](/wiki/Unit_of_Length), defined as the approximate mean distance from the [Earth](/wiki/Earth) to the [Sun](/wiki/Sun). It serves as a celestial ruler, primarily used for measuring distances within our [Solar System](/wiki/Solar_System).
+## See also
+- [Light-Year](/wiki/Light-Year)
+- [Parsec](/wiki/Parsec)
+- [Orbit](/wiki/Orbit)
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