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Astronomical Unit (a.u.) of Length


The astronomical unit (a.u.) is a unit of length used primarily in astronomy to describe distances within our solar system. It is defined as the average distance between the Earth and the Sun.


Key facts:



  • 1 astronomical unit ≈ 149,597,870.7 kilometers (about 93 million miles)



  • Used to measure distances between planets and other objects in the solar system



  • Provides a convenient scale for expressing space distances that are too large for kilometers but too small for light-years



The astronomical unit helps astronomers communicate and calculate orbits, planetary positions, and space missions with clarity and precision.




Arpent


An arpent is a traditional unit of length and area used primarily in French-speaking regions, especially in parts of Canada (like Quebec) and Louisiana in the United States. It originated in France and was commonly used in land measurement and agriculture.



  • As a length, one arpent is approximately 192 feet (about 58.47 meters), though it varies regionally.



  • As an area, an arpent is roughly equal to 0.84 acres or about 3,400 square meters.



The arpent was important for defining land parcels during French colonial times and is still referenced in legal land descriptions in some areas today.


Summary:



  • Length: ~192 feet (58.47 meters)



  • Area: ~0.84 acres (3,400 m²)



  • Used historically in French-influenced regions for land measurement



  • Still appears in land records and legal contexts in parts of North America




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