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The astronomical unit (symbol: au, or AU) is a unit of length defined to be exactly equal to 149,597,870,700 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.
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Learn the definition, conversion, and facts of the astronomical unit (AU), the average distance between Earth and the Sun. Find out how it is measured and used in astronomy and space exploration.
- The Editors of Encyclopaedia Britannica
The astronomical unit ( AU) is a unit of length derived from the Earth's orbit. It is the average distance the Earth gets from the Sun on the long axis of the ellipse. Its definition is: the length of the semi-major axis of the Earth's elliptical orbit around the Sun. "Semi-major" means half the long axis.
Jul 31, 2022 · An astronomical unit (AU) is the average distance of Earth from the sun, about 93 million miles or 150 million kilometers. Learn how AU is used to measure distances in the solar system and compare it with light-years.
Mar 28, 2017 · An Astronomical Unit (AU) is the average distance between the Earth and the Sun, which is used to measure cosmic distances. Learn how this unit was developed, how it varies over time, and how it relates to other astronomical constants.
