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Astronomical unit - Wikipedia
https://en.wikipedia.org/wiki/Astronomical_unit
WEBThe 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 originally 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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Astronomical unit (AU, or au) | Definition, Conversion, & Facts
https://www.britannica.com/science/astronomical-unit
WEBastronomical unit (AU, or au), a unit of length effectively equal to the average, or mean, distance between Earth and the Sun, defined as 149,597,870.7 km (92,955,807.3 miles). Alternately, it can be considered the length of the semimajor axis—i.e., the length of half of the maximum diameter—of Earth’s elliptical orbit around the Sun.
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EarthSky | What is an astronomical unit?
https://earthsky.org/space/what-is-the-astronomical-unit/
WEBJul 31, 2022 · An astronomical unit - or AU - is a measurement that astronomers use to describe distances in the solar system. Find out how long an AU is here.
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Astronomical unit Definition & Meaning - Merriam-Webster
https://www.merriam-webster.com/dictionary/astronomical%20unit
WEBOct 11, 2023 · The meaning of ASTRONOMICAL UNIT is a unit of length used in astronomy equal to the mean distance of the earth from the sun or about 93 million miles (150 million kilometers).
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ASTRONOMICAL UNIT Definition & Meaning | Dictionary.com
https://www.dictionary.com/browse/astronomical-unit
WEBastronomical unit. A unit of length equal to the average distance from Earth to the Sun, approximately 149.6 million km (92.8 million mi). It is used especially to measure distances within the solar system. Compare light-year parsec.
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What is an Astronomical Unit? | Cool Cosmos
https://coolcosmos.ipac.caltech.edu/ask/301-What-is-an-Astronomical-Unit-
WEBAn Astronomical Unit (AU) is the average distance between Earth and the Sun, which is about 93 million miles or 150 million kilometers. Astronomical units are usually used to measure distances within our Solar System.
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astronomical unit summary | Britannica
https://www.britannica.com/summary/astronomical-unit
WEBastronomical unit (AU), unit of length effectively equal to the average distance between Earth and the Sun, defined as 149,597,870.7 km (92,955,807.3 mi). The astronomical unit provides a convenient way to express and relate distances of objects in the solar system and to carry out various astronomical calculations. Edmond Halley Summary.
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What is an Astronomical Unit? - Universe Today
https://www.universetoday.com/46796/1-au/
WEBMar 28, 2017 · Definition: According to the current astronomical convention, a single Astronomical Unit is equivalent to 149,597,870.7 kilometers (or 92,955,807 miles). However, this is the average...
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Measuring the Universe | IAU - International Astronomical Union
https://www.iau.org/public/themes/measuring/
WEBThe unique symbol for the astronomical unit is au. The IAU also defines other astronomical units: the astronomical unit of time is 1 day (d) of 86,400 SI seconds (s) (SI is the International System of Units) and the astronomical unit of mass is equal to the mass of the Sun, 1.9891×10 30 kg.
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Au - NASA
https://ssd.jpl.nasa.gov/glossary/au.html
WEBGlossary. au (astronomical unit) Definition. The astronomical unit (au) is defined by the IAU as exactly 149,597,870,700 m. Notes. It is approximately the average distance between the Earth and the Sun (about 150 billion meters). The IAU has specified that this term is lower-case “au”, so “AU” is technically incorrect.
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