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单词 astronomical unit
释义
astronomical unit
Physics

  • The mean distance between the sun and the earth. It is equal to 149 597 870 km (499 light seconds).

Astronomy

  • A unit of length equal to the mean distance of the Earth from the Sun. It is formally defined as 149 597 870 700 m exactly. This definition was introduced in 2012 by the International Astronomical Union, along with the abbreviation au (lowercase), replacing the former abbreviation AU (uppercase).

Space Exploration

  • A unit equal to the mean distance of the Earth from the Sun: 149.6 million km. It is used to describe planetary distances. Light travels this distance in approximately 8.3 minutes.

Geology and Earth Sciences

  • The average distance between the Earth and Sun; a unit of measurement equal to 149 597 870 km.
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