Astronomical unit
{{Unit of length
name=astronomical unit
m=149597870691
accuracy=3The astronomical unit (AU or au or a.u. or sometimes ua) is a unit of length.
Astronomical Unit
Related Category: Astronomy: General
(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.
astronomical unit (AU)
The mean distance between the Earth and the Sun. 1 AU = 149,597,870 kilometers = 92,955,806 miles = 499 light-seconds. One light-year equals 63,240 AU.
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Astronomical Unit
Distances in the Solar System are very large! To compare the average distances between the Sun and the planets, it's convenient to do it in terms of the average Earth-Sun separation.
astronomical unit
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Astronomical unit
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ASTRONOMICAL UNIT
An astronomical unit, or AU, is equal to the mean (average) distance from the Earth to the Sun, which is about 92,957,000 miles (149,600,000 km).
AU, Astronomical Unit PlanetAverage Distance from the Sun
(measured in AU) ...
Astronomical Unit
The of the 's orbit around the at one particular epoch (I believe the year 1900), equal to m according to the International Astronomical Union 1976 System of Astronomical Constants.
The Astronomical Unit is the average distance between the Sun and Earth. Its value is 149,597,870 km (about 93 million miles).
Astronomical Unit (A.U.)
An astronomical unit (A.U.) is the average distance between the Earth and the Sun, which is about 93 million miles or 150 million kilometers.
Astronomical Unit
This is slightly less than the mean distance from the Earth to the Sun, approx. 149,597,870.691km or about 93 million miles.
Astronomical Unit: A unit of distance equal to the average spacing between the Earth and the Sun. Usually abbreviated A.U.
ASTRONOMICAL UNIT
The approximate distance from the Sun to the Earth which is equal to 150,000,000 kilometers.
ASTROPHYSICS
The branch of astronomy that deals with the physics of stellar phenomena.
Astronomical unit (AU): the average distance from the sun to Earth -- about 93 million miles (149 million kilometers). Earth is 1 AU from the sun.
Astronomical Unit (AU). Approximately equal to the mean earth-sun distance, which is about 150,000,000 km or 93,000,000 miles.
astronomical unit (AU)
149,597,870 km; the average distance from the Earth to the Sun.
astrochemistry
The study of the chemical interactions between the gases and dust interspersed between the stars.
Astronomical Unit (AU):
Average distance of the Earth from the Sun. Approximately equal to 150 million kilometres.
Astronomical Unit (AU). The mean Earth-Sun distance, equal to 1.496E+13cm or 214.94 solar radii.
Astronomical unit The average distance from Earth to the Sun, approximately 149.6 million km, which equals 1 AU.
Astronomical unit (AU)
the average distance from the Earth to the Sun; 1 AU is 149,597,870 kilometers (92,960,116 miles).
astronomical unit (A.U.) The average distance of Earth from the Sun. Precise radar measurements yield a value for the A.U. of 149,603,500 km.
astronomical units
a measurement used by astronomers within the solar system; one astronomical unit (AU) is the average distance between Earth and the sun (about 93,000,000 miles or 150,000,000 kilometers)
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Astronomical Unit (AU) The mean distance from the Earth to the Sun, i.e. 149,597,870 km or 499.005 light seconds.
Attitude The orientation of a spacecraft or satellite with respect to its direction of motion.
Astronomical Unit (AU) - The average distance between the Earth and the Sun
Asymptotic Giant Branch (AGB) - The portion of the H-R diagram occupied by enormous, cool stars with helium-burning shells ...
Astronomical Unit (AU). The mean distance between Earth and the Sun. A unit of distance, equal to 149 600 000 kilometres (92 900 000 miles).
Astrophysics. The study of the physical nature of celestial objects.
Astronomical unit (AU). Mean Sun-Earth distance, used as scaling distance in the solar system. Using Kepler's laws, it is easy to derive distances in this system as measured in astronomical units.
ASTRONOMICAL UNIT (AU) - Semi-major axis of the elliptical orbit of the Earth. The astronomical unit is also described as the "mean" distance (average of aphelion and perihelion distances) between the Earth and the Sun.
Astronomical Unit
(a) Mean distance between the Earth and the Sun: 149,598,500km.
(b) The AU is the preferred unit for distances within the Solar System. Mercury, the innermost planet, lies on average 0.
Astronomical Unit
Auger Effect
(a) The ejection of an electron from an atom or ion without the emission of radiation (x-rays or gamma rays). It results from the de-excitation of an excited electron within the atom.
One Astronomical Unit (AU) is equal to the distance from the Earth to the Sun - about 93 million miles (150 million kilometers).
The heliopause is somewhere between 5 and 14 billion miles from the Sun.
astronomical unit (AU) - a unit of length equal to the mean radius of the earth's orbit around the sun (93 million miles).
Astronomical Unit
A unit used for measuring distances which is equal to the average distance from the Earth to the Sun (150 million km).
Astronomy ...
astronomical unit
the average distance from Earth to the sun, equal to about 93,000,000 miles (150,000,000 km)
autumnal equinox ...
astronomical unit
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AU: (astronomical unit) The average Earth-Sun distance, equal to 149.5 million kilometers or 93 million miles.
AU -- Astronomical Unit, based on the mean Earth-to-sun distance, 149,597,870 km. Refer to "Units of Measure" section for complete information.
AZ -- Azimuth.
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Magnitude: An astronomical unit of brightness. Originally corresponding to the eye's response to starlight, the magnitude system is logarithmic, with 5 magnitudes corresponding to a factor of 100 in brightness.
astronomical unit light year
Review Questions
The fastest plane can travel at about 4400 kilometers/hour. How long would it take to travel to the Sun? Convert your answer to the number of days and then the number of years.
By definition, the average distance between the Earth and the Sun is called one astronomical unit, 1 A.U., which is about 1.5x1011 meters. The ratio of the diameter of the Earth to 1 A.U. is about 1:10,000. Here shows the size of the orbits.
AU is short for Astronomical Unit. One AU is equal to the distance from the Earth to the Sun -- about 93 million miles (150 million kilometers).
55 astronomical units around the Sun and a diameter of 240 km. amplidyne (NASA SP-7, 1965) A special type of direct current generator used as a power amplifier in which the output voltage responds to changes in field excitation; ...
084 X 10E13 kilometers = 206,265 astronomical units = 3.262 light years part 1. One of the constituents into which a thing may be divided. Applicable to a major assembly, subassembly, or the smallest individual piece in a given thing. 2.
Though they average 24 astronomical units apart (23 percent farther than Uranus is from the Sun), the elliptical orbit sends them from a farthest distance of 36 astronomical units to 11, about Saturn's solar distance.
1672 - Jean Richer and Giovanni Cassini measure the astronomical unit to be about 138,370,000 km
1675 - Ole Rømer uses the orbital mechanics of Jupiter's moons to estimate that the speed of light is about 227,000 km/s ...
Travelling over hundreds or thousands of light years, a laser beam could easily be made to widen so that it encapsulates a target ten astronomical units across - in our Solar System that would include everything within the orbit of Jupiter.
(a) The distance at which one astronomical unit subtends an angle of one second of arc; equivalently, the distance to an object having an annual parallax of one second of arc. (abbreviation for parallax second) [S92] ...
As you can see although an Astronomical Unit is very useful for dealing with distances within our Solar System, it's not going to help us much when we go out to the stars - even the nearest ones.
8 astronomical units (AU) from the Sun; for elaboration of this idea, see below Origin and evolution of the asteroids.
7 times the Earth-Sun distance (astronomical unit or AU) from Sol. Two "clouds" of icy asteroids 60° ahead and behind Jupiter (and at or near Jupiter's orbital distance from the sun) are called "Jupiter Trojans" (diagram), ...
a terrestrial orbit asteroid now called a dwarf planet or small solar-system body, depending on its characteristics astrology a belief system which claims that the positions of celestial objects can affect life on Earth astronomical unit ...
Large lengths, such as the radius of a giant star or the semi-major axis of a binary star system, are often expressed in terms of the astronomical unit (AU) — ...
2 astronomical units (equivalent to 1.67 billion km or about the mean distance between the Sun and Saturn), or recede as far as 35.6 AU (5.3 billion km-approximately the distance from the Sun to Pluto).
(This distance, known as the astronomical unit, is one of the fundamental constants of astronomy.) Observations of the 1761 transit were only partially successful but did result in the first suggestion, by the Russian astronomer Mikhail V.
Astronomical Unit of Michigan - Michigan
Delta Astronomical Society - Escanaba, Michigan
Eastern Michigan University Astronomy Club - Ypsilanti, Michigan
Ford Amateur Astronomy Club - Dearborn, Michigan ...
Neptune is currently the most distant planet from the Sun, with an orbital radius of 30 Astronomical Units and an orbital period of 165 years. Its diameter is about four times that of the Earth, which makes it the 4th largest planet.
(Astronomical Unit). This is useful for measuring distances within the solar system. There is also the distance of a light-year - the distance light travels in one year.
The dimensions of this system are specified in terms of the mean distance from the earth to the sun, called the astronomical unit (AU). One AU is about 150 million km (about 93 million mi). The most distant known planet, Pluto, has an orbit at 39.
In 1951, astronomer Gerald Kuiper suggested that another belt of comets existed beyond the orbit of Neptune, between 30 and 50 astronomical units (4.5 to 7.5 thousand million km) from the Sun.
The basic unit of distance for the Solar System is the Astronomical Unit (AU). Roughly speaking, this is the distance of Earth from the center of the Sun.
That brings us to the other useful astronomical unit of measurement. Indeed, it is called an "Astronomical Unit" or AU. One AU is the distance from the Earth to the Sun.
 See also: Orbit, Solar, Distance, Sun, Light
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