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astronomical unit
astronomical unitn. 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
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.Thesaurus| Noun | 1. |  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)AUastronomy unit - a linear unit used for astronomical distances |
Translationsastronomical unit
astronomical unit (AU), mean distance between the earth and sun; one AU is c.92,960,000 mi (149,604,970 km). The astronomical unit is the principal unit of measurement within the solar system, e.g., Mercury is just over 1-3 AU and Pluto is about 39 AU from the sun.astronomical unit (AU or au) A unit of length that is used for distances, especially within the Solar System. It is effectively the mean distance between Earth and Sun. It is defined formally in terms of Kepler's third law and the Gaussian gravitational constant. One astronomical unit is equal to 149 597 870 kilometers or 499.005 light-seconds.astronomical unit[‚as·trə′näm·ə·kəl ′yü·nət] (astronomy) Abbreviated AU. A measure for distance within the solar system equal to the mean distance between earth and sun, that is, about 92,956,000 miles (149,598,000 kilometers). The semimajor axis of the elliptical orbit of earth. astronomical unit 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 MedicalSeeA.U.FinancialSeeAUAcronymsSeeAuAstronomical Unit
Related to Astronomical Unit: parsecSynonyms for Astronomical Unitnoun a unit of length used for distances within the solar systemSynonymsRelated Words |