what is an astromical unit?

Answer 1

The astronomical unit (AU) is a unit of length nearly equal (but not exactly equal) to the semi-major axis of Earth's orbit around the Sun. The currently accepted value of the AU is 149,597,870,691 ± 30 metres (92,955,807 miles).

Originally, the AU was defined as the length of the semi-major axis of the Earth's elliptical orbit. In 1976, the International Astronomical Union revised the definition of the AU for greater precision, defining it as the distance from the centre of the Sun at which a particle of negligible mass, in an unperturbed circular orbit, would have an orbital period of 365.2568983 days (one Gaussian year).

More accurately, it is the distance at which the heliocentric gravitational constant is equal to (0.017 202 093 95)² AU³/d².

So now you know!

Answer 2

1 astronomical unit is 93 million miles - that is the distance of the Earth from the Sun. Astronomers use this measurement to help them more quickly comprehend the great distances between celestial bodies and other phenomena in outer space.

Answer 3

It is defined as the average distance from Earth's centre to the sun's centre. Currently, the accepted value is 150 million kilometres or 93 million miles.

Answer 4

An astronomical unit (AU) is the mean distance from the earth to the sun

Answer 5

The distance between the Earth and Sun.

Answer 6

i just learned this what it means is that the distances away from the sun and earth

Example:
Jupiter is 5.20 astronomical units away from the sun

Answer 7

93 million miles

Answer 8

93,000,000 miles, the distance from Earth to the sun.