The astronomical unit is used primarily as a convenient yardstick for measuring distances within the Solar System. However, it is also a fundamental component in the definition of another critical unit of astronomical length, the parsec. ==Development of unit definition== The Earth`s orbit around the Sun is shaped like an ellipse. The semi-major ....
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http://en.wikipedia.org/wiki/Astronomical_unit
A unit of distance equal to the average spacing between the Earth and the Sun. Usually abbreviated A.U., it is equal to about 150 million kilometers (93 million miles), and is a distance that light takes about 8 minutes to cover. It is a handy size for use for expressing distances in the solar system. For example, the diameter of the orbit of the m...
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http://www.astrosociety.org/education/publications/tnl/14/14.html
The mean distance of Earth from the Sun, i.e. 92,955,807 miles (149,597,870 km).
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http://www.braeunig.us/space/glossary.htm
a unit of length effectively equal to the average, or mean, distance between Earth and the Sun. Alternately, it can be considered the length of the ... [4 related articles]
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http://www.britannica.com/eb/a-z/a/116
(AU) The mean distance between the Earth and the Sun. 1 AU = 149,597,870 kilometers = 92,955,806 miles = 499 light-seconds. One light-year equals 63,240 AU.
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http://www.daviddarling.info/encyclopedia/A/AU.html
The average distance from Earth to the Sun, slightly less than 93 million miles.
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http://www.skyandtelescope.com/astronomy-terms/
A unit used for measuring distances which is equal to the average distance from the Earth to the Sun (150 million km).
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http://www.solarspace.co.uk/Glossary.php
[
n] - a unit of length used for distances within the solar system
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http://www.webdictionary.co.uk/definition.php?query=Astronomical%20Unit
a unit of length used by astronomers. One astronomical unit equals the distance from Earth to the Sun: 93 million miles
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https://sciencetrek.org/sciencetrek/topics/astronomy/glossary.cfm
a unit of length used by astronomers. One astronomical unit equals the distance from Earth to the Sun: 93 million miles
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https://sciencetrek.org/sciencetrek/topics/planets/glossary.cfm
An astronomical unit (AU) is defined as the average distance between the Earth and the Sun (approximately 148 million kilometers).
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https://www.encyclo.co.uk/local/20750
AU noun a unit of length used for distances within the solar system; equal to the mean distance between the Earth and the Sun (approximately 93 million miles or 150 million kilometers)
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https://www.encyclo.co.uk/local/20974
Unit equal to the mean distance of the Earth from the Sun: 149.6 million km/92.96 million mi. It is used to describe planetary distances. Light travels this distance in approximately 8.3 minutes
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https://www.encyclo.co.uk/local/21221
The distance from the Earth to the Sun. Usually written AU.
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https://www.encyclo.co.uk/local/22784
a unit of length used by astronomers. One astronomical unit equals the distance from Earth to the Sun: 93 million miles
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https://www.encyclo.co.uk/local/22786
a unit of length, equal to the mean distance of the earth from the sun: approximately 93 million miles (150 million km). Abbr.: AU
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https://www.infoplease.com/dictionary/astronomical-unit
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