# Convert Astronomical unit to...

Astronomical unit | |
---|---|

Unit system | astronomical |

Unit of | length |

Symbol | au |

Unit conversions | |

1 au in ... |
... is equal to ... |

SI units | 149597.9×10^{3} km |

Imperial/US unit(s) | 9.2956×10^{7} mi |

Astronomical unit(s) | 4.8481×10^{-6} pc |

**I want to convert:**
**using**

Metric | Conversion |
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Kilometre [km] | |

Hectometre [hm] | |

Decametre [dam] | |

Metre [m] | |

Decimetre [dm] | |

Centimetre [cm] | |

Millimetre [mm] | |

Micrometre [µm] | |

Nanometre [nm] | |

Angstrom [Å] |

British/Imperial | Conversion |
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League | |

Mile [mi] | |

Furlong | |

Chain | |

Rod [rd] | |

Yard [yd] | |

Foot [ft] | |

Link | |

Hand | |

Inch [in] | |

Line | |

Mil [mil] | |

Thou [thou] |

Nautical | Conversion |
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Sea mile | |

Fathom |

Astronomical | Conversion |
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Parsec [pc] | |

Light Year | |

Astronomical Unit [AE] | |

Light Minute | |

Light Second |

The **astronomical unit** is a unit of length, roughly the distance from Earth to the Sun. However, that distance varies as Earth orbits the Sun, from a maximum (aphelion) to a minimum (perihelion) and back again once a year.

Originally conceived as the average of Earth's aphelion and perihelion, it is now defined as exactly 149597870700 metres (about 150 million kilometres, or 93 million miles).

The **astronomical unit** is used primarily as a convenient yardstick for measuring distances within the Solar System or around other stars. However, it is also a fundamental component in the definition of another unit of astronomical length, the parsec.

This article uses material from the Wikipedia article "Astronomical unit", which is released under the Creative Commons Attribution-Share-Alike License 3.0.