Astronomical unit (AU)

The astronomical unit (AU) is a unit of length, roughly the distance from Earth to the Sun. It is used by astronomers to measure large distances to astronomical objects, and is also the unit of choice for measuring distances within the Solar System.

One AU is equal to 149,597,870.7 kilometers, or about 93 million miles. The exact value of the AU changes over time, due to the changing position of the Earth in its orbit around the Sun. As of 2019, the most recent value for the AU is 149,598,262 kilometers, or about 93 million miles.

The astronomical unit was originally defined as the mean distance between the Earth and the Sun, based on the orbit of the Earth around the Sun. However, it is now defined as a unit of length, based on the fixed length of the meter. This change was made in order to keep the AU a consistent unit of length, regardless of the changing position of the Earth in its orbit. What is the unit of 1 AU? 1 AU stands for 1 Astronomical Unit. It is a unit of length that is equal to about 150 million kilometers, or about 93 million miles.

What does AU mean in NASA? The term "AU" is used by NASA to refer to the astronomical unit of measurement. One AU is equal to the average distance between the Earth and the Sun, which is about 93 million miles. This unit of measurement is used by NASA in order to calculate distances between objects in the solar system. How much is an AU space? An AU space is a unit of measurement used to describe data storage capacity. It is equivalent to 1,024 terabytes (TB) or 1,048,576 gigabytes (GB).

Why is AU used?

The International Organization for Standardization (ISO) is a standards body that develops and publishes international standards. One of the standards that they have developed is the International Standard for country codes, ISO 3166. This standard includes a two-letter code for each country, and these codes are used in a variety of applications.

One such application is the Domain Name System (DNS), which is the system that maps domain names (like to IP addresses (like When a user types in a domain name, the DNS system looks up the corresponding IP address and then connects the user to the website.

The DNS system uses a hierarchy of domains, and at the top level, there are two domains for each country. For example, the domain for the United States is us. and the domain for Australia is au.

The country code for Australia is AU, so the AU top-level domain is used for websites that are specifically targeted at Australian users. How do you convert AU to km? There is no definitive answer to this question as the conversion factor between AU and km can vary depending on the specific definition of an AU. However, a typical conversion factor is 149,597,870.7 km per AU. Therefore, to convert AU to km, you would multiply the number of AU by 149,597,870.7.