What is astronomical unit?

Answer 1

ASTRONOMICAL UNIT (AU): 1 AU = 149,597,870.691 kilometers. An AU is approximately the mean distance between the Earth and the Sun.

source: neo.jpl.NASA.gov/glossary

Answer 2

An Astronomical Unit (AU) is equal to the following common distance terms. 149,600,000 kilometres 92,960,000 miles 163,600,000,000 yards 490,800,000,000 feet 5,890,000,000,000 inches 0.00001581 light years 8.317 light minutes

Answer 3

An "astronomical unit" is a unit of distance/length that is the mean distance between the center of the Sun and the center of the Earth.

It is an ISO standard with the value defined as 149,597,870,700 metres (92,955,807.273 mi) exactly. It is given the symbol "AU", while the astronomical constant (whose value is one astronomical unit) is given the symbol "A".

Answer 4

1 Astronomical Unit = 92,955,887.6 miles or 149,598,000 kilometers

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1 AU = 149,597,870.691 kilometers

An Astronomical Unit is approximately the mean distance between the Earth

and the Sun. It is a derived constant and used to indicate distances within the

solar system.

Its formal definition is the radius of an unperturbed circular orbit a massless body

would revolve about the sun in 2*(pi)/k days (i.e., 365.2568983.... days), where k

is defined as the Gaussian constant exactly equal to 0.01720209895.

Since an AU is based on radius of a circular orbit, one AU is actually slightly less

than the average distance between the Earth and the Sun (approximately 150

million km or 93 million miles).

Answer 5

The AU is defined as the average distance between the Earth and Sun ... in

the neighborhood of 93 million miles. It's a handy unit for describing distances

in and around the solar system, but not too useful past that. The nearest star

outside the solar system is something like 63,000 AU from us, so once you

expand your attention outside the solar system, you need some heavy-duty

distance units. That's where the light-year and the parsec come in.

Answer 6

An Astronomical Unit (commonly abbreviated as AU) is the average distance from the Earth to the Sun (roughly 93 million miles). It is used as a unit of measurement for distances less than a light-year but too large to easily use kilometers.

Answer 7

an astrnomical unit is the measure of distance between the sun and earth or about 93 million miles /149 million kilometres.for example jupiters orbit though eliptical is an average distance of 5 au

Answer 8

One Astronomical Unit, or "AU" is the average distance between the Earth and the Sun; 93 million miles.

Answer 9

150 million km or 93 million miles. The average distance between Earth and the Sun.

Answer 10

1 astronomical unit ≡ 149,597,870.7 kilometers ≈ 92,955,807 miles

It is approximately the average distance between the sun and the earth.