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.
Prior to instruction, all of the students completed an astronomy unit pretest.