Astronomical unit

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What Wikipedia says

The astronomical unit (symbol: au or AU) is a unit of length defined as 149597870700 m. Historically, the astronomical unit was conceived as the average Earth-Sun distance (the average of Earth's aphelion and perihelion), before its modern redefinition in 2012.

Excerpt from the Wikipedia article “Astronomical unit”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Original: Huritisho Vector: Mrmw, CC BY-SA 4.0, via Wikimedia Commons.