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- DictionaryAs·tro·nom·i·cal u·nit/ˌastrəˈnäməkəl ˈyo͞onət/
noun
- 1. a unit of measurement equal to 149.6 million kilometers, the mean distance from the center of the earth to the center of the sun.
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astronomical 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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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.
Oct 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).
An 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 ...
Mar 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...
Apr 17, 2024 · An Astronomical Unit (AU) is a unit of measurement used in astronomy to represent the average distance between the Earth and the Sun. It is a fundamental unit of measurement in the field of astronomy and is used to measure distances within our solar system. II. How is the Astronomical Unit defined?
astronomical unit. / ăs′trə-nŏm ′ ĭ-kəl /. 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.
