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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.
- Astronomical system of units - Wikipedia
The astronomical system of units, formerly called the IAU...
- Astronomical unit - Simple English Wikipedia, the free encyclopedia
The astronomical unit (AU) is a unit of length derived from...
- Astronomical system of units - Wikipedia
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 parsec (symbol: pc) is a unit of length used to measure the large distances to astronomical objects outside the Solar System, approximately equal to 3.26 light-years or 206,265 astronomical units (AU), i.e. 30.9 trillion kilometres (19.2 trillion miles ).
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.
