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What (who) is astronomic$5558$ - definition
![The ''astronomical unit'' is used as the baseline of the triangle to measure [[stellar parallax]]es (distances in the image are not to scale)](https://commons.wikimedia.org/wiki/Special:FilePath/Stellarparallax parsec1.svg?width=200 "The ''astronomical unit'' is used as the baseline of the triangle to measure [[stellar parallax]]es (distances in the image are not to scale)")
![Transits of Venus across the face of the Sun were, for a long time, the best method of measuring the astronomical unit, despite the difficulties (here, the so-called "[[black drop effect]]") and the rarity of observations.](https://commons.wikimedia.org/wiki/Special:FilePath/Venustransit 2004-06-08 07-44.jpg?width=200 "Transits of Venus across the face of the Sun were, for a long time, the best method of measuring the astronomical unit, despite the difficulties (here, the so-called \"[[black drop effect]]\") and the rarity of observations.")
The astronomical unit (symbol: au, or AU or AU) is a unit of length, roughly the distance from Earth to the Sun and equal to 150 million kilometres (93 million miles) or 8.3 light minutes. The actual distance from Earth to the Sun varies by about 3% as Earth orbits the Sun, from a maximum (aphelion) to a minimum (perihelion) and back again once each year. The astronomical unit was originally conceived as the average of Earth's aphelion and perihelion; however, since 2012 it has been defined as exactly 149597870700 m (see below for several conversions).
The astronomical unit is used primarily for measuring distances within the Solar System or around other stars. It is also a fundamental component in the definition of another unit of astronomical length, the parsec.
Wikipedia
Piera Observatory (Catalan: Observatori Astronòmic de Piera) is an astronomical observatory located in Piera, Catalonia, with the IAU observatory code 165.
It takes part in the Unicorn Project with the Ametlla de Mar Observatory and Costitx Observatory. One of its first discoveries was the asteroid 1999 YZ8 (by Joan Guarro), now 13868 Catalonia. Josep Comas Solá's discovery, nearly 70 years earlier, of 1930 SB was initially supposed to be named Catalonia, but political pressure from the Francoist regime then in power made this impossible. Solá finally named it 1188 Gothlandia instead, from the ancient Frankish name for Catalonia, Gothland or Gotia.
