astronomy unit

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Noun1.astronomy unit - a linear unit used for astronomical distances
linear measure, linear unit - a unit of measurement of length
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
References in periodicals archive ?
The students study constellations, star distances, and stellar evolution as part of their Astronomy unit in Earth Science.
Professor Carl Murray from Queen Mary's astronomy unit added: "Kevin Beurle joined the Astronomy Unit in 1991 and rapidly became an invaluable member of the Cassini group at Queen Mary.