astronomical unit


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astronomical unit

n. Abbr. AU
A unit of length used in measuring astronomical distances within the solar system or other planetary system equal to the mean distance from Earth to the sun, approximately 150 million kilometers (93 million miles).

astronomical unit

n
(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

astronom′ical u′nit


n.
a unit of length, equal to the mean distance of the earth from the sun: approximately 93 million miles (150 million km). Abbr.: AU
[1900–05]

as·tro·nom·i·cal unit

(ăs′trə-nŏm′ĭ-kəl)
A unit of length equal to the average distance from Earth to the sun, approximately 93 million miles (150 million kilometers). It is used to measure distances within the solar system.

astronomical unit


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1. (au) The mean Sun to Earth distance, equal to 92,955,807 mi (149,597,870 km). Agreed internationally in 1964, but its value has altered.
2. (au) A unit of measure based on the distance between the Earth and the Sun. Approximately equal to 1.5 x 108 km.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.astronomical unit - a unit of length used for distances within the solar systemAstronomical 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)
astronomy unit - a linear unit used for astronomical distances
Translations
Astronomische Einheit
References in periodicals archive ?
The latest discovery is of a third star in the system, which orbits the primary star from a distance of 28 astronomical units -- close enough to have influenced the hot Jupiter's development and final orbit.
They took measurements at seven points which allowed them to approximate the distance of an astronomical unit Although 12 pupils were directly involved in the collecting of the data, the whole school took turns to use the telescopes.
com/astronomers-reach-verdict-distance-earth-sun-finally-790128) voted to fix the astronomical unit at 149,597,870,700 meters (92,955,807.
08 astronomical unit, exactly what's expected for a dusty disk.
In 2013, Apophis will come within a tenth of an astronomical unit 6 nearly 9,000,000 miles 6 of earth.
The new fixed distance replaces a complicated equation that served as the previous definition of an astronomical unit.
The Kuiper belt extends outward from the orbit of Pluto to about 70 times the Earth-sun distance, which defines an astronomical unit (AU).
This number, known as the astronomical unit, could then be used to calculate the distance between other planets and the sun.
08 astronomical unit, or less than one-fifth the size of Mercury's orbit.
I was startled to read that Gliese 710 will pass within 16,000 astronomical units of the Sun (S&T: Dec.
50 Newmarket A circumstellar disc in the solar system beyond the planets, extending from the orbit of Neptune to approximately 50 astronomical units from the sun.
They noticed that beyond 150 astronomical units (150 times the distance from the sun to the Earth), 10 previously discovered objects, along with Sedna and 2012 [VP.