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astronomical unit

   Also found in: Medical, Financial, Acronyms, Encyclopedia, Wikipedia, Hutchinson 0.03 sec.
astronomical unit
n. Abbr. AU
A unit of length used in measuring astronomical distances within the solar system equal to the mean distance from Earth to the sun, approximately 150 million kilometers (93 million miles).
astronomical unit
n
(Mathematics & Measurements / Units) a unit of distance used in astronomy equal to the mean distance between the earth and the sun. 1 astronomical unit is equivalent to 1.495 ✕ 1011 metres or about 9.3 ✕ 107 miles
astronomical unit  (str-nm-kl)
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-yearparsec
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.Astronomical Unit - 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)
AU
astronomy unit - a linear unit used for astronomical distances


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? Mentioned in ? References in periodicals archive
 
The Kuiper belt extends outward from the orbit of Pluto to about 70 times the Earth-sun distance, which defines an astronomical unit (AU).
Outer limits: solar system at the fringe by Cowen, Ron / Science News
To make the millions of kilometers between the planets easier to visualize, scientists use a scale called astronomical unit (AU), where 1 AU equals the distance from Earth and Sun (about 149,600,000 kilometers).
Are we there yet? (Math Skills) by Science World
An order for 56 circuit card assemblies will be followed six months later-- too late to be added to the first production run-- by an order for one or two or three of the same item at a relatively astronomical unit price.
The case for the $435 hammer by Fairhall, James / Washington Monthly
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