astronomy unit

Noun
  1. A linear unit used for astronomical distances (synset 113670672)
    is a type of: linear measure, linear unit - a unit of measurement of length
    subtypes:
    • light year, light-year - the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers
    • light hour - the distance light travels in a vacuum in one hour; approximately one billion kilometers
    • light minute - the distance light travels in a vacuum in one minute; approximately 18 million kilometers
    • light second - the distance light travels in a vacuum in one second; approximately 300,000 kilometers
    • astronomical unit, au - 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)
    • parsec, secpar - a unit of astronomical length based on the distance from Earth at which stellar parallax is 1 second of arc; equivalent to 3.262 light years

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