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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, 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). The astronomical unit provides a convenient way to express and relate distances of objects in the solar system and to carry out astronomical calculations.
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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 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.
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Astronomical unit - Simple English Wikipedia, the free encyclopedia
https://simple.wikipedia.org/wiki/Astronomical_unit
WebThe 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.
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Measuring the Universe | IAU - International Astronomical Union
https://www.iau.org/public/themes/measuring/
WebThe 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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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). …
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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. For example, the planet Mercury is about 1/3 of an AU from the sun, while the farthest planet, Pluto, is about 40 AU from the ...
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Cosmic Distances - Science@NASA
https://science.nasa.gov/solar-system/cosmic-distances/
WebMay 18, 2020 · Astronomical units, abbreviated AU, are a useful unit of measure within our solar system. One AU is the distance from the Sun to Earth's orbit, which is about 93 million miles (150 million kilometers).
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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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