![]() Symbols, abbreviations, or full names for units of length,Īrea, mass, pressure, and other types. You can find metric conversion tables for SI units, as wellĪs English units, currency, and other data. The International Astronomical Union recommends "au" and international standard ISO 31-1 uses "AU".Ĭonversion calculator for all types of measurement units. The symbol "ua" is recommended by the Bureau International des Poids et Mesures, but in the United States and other anglophone countries the reverse usage is more common. The unit most commonly used in professional astronomy is the parsec (symbol: pc, about 3.26 light-years) which derives from astrometry it is the distance at which one astronomical unit (au) subtends an angle of one second of arc. It is used more often in popular culture than in astronomical calculations. It represents the distance that light travels in one Julian year in a vacuum. The currently accepted value of the AU is 149 597 870 691 ± 30 metres (about 150 million kilometres or 93 million miles). In astronomy, because of the great distances under consideration, additional units are used for convenience. It is approximately equal to the mean distance between the Earth and Sun. It stands for "parallax of one arc second", and is approximately 19,131,554,073,600 (19 trillion) miles. One parsec is approximately equal to 3.26 light-years, or 3.086 x 1013 km. The parsec (symbol pc) is a unit of length used in astronomy. describe how astronomers use parallax to directly measure distances to nearby. You can do the reverse unit conversion fromĪU to parsec, or enter any two units below: Enter two units to convert From: ![]()
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