Convert a.u. of length to foot (US survey) Online | Free Length Converter

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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.



Foot (US Survey)


The US survey foot is a unit of length used historically in the United States for land surveying and mapping. It is defined as exactly 1200/3937 meters, which is approximately 0.3048006096 meters. This makes it very slightly longer than the international foot, which is exactly 0.3048 meters.


The US survey foot was established to maintain consistency with earlier land surveys and legal descriptions in the U.S. It was used extensively in the Public Land Survey System and other cadastral surveys.


Key points:



  • 1 US survey foot = 1200/3937 meters ≈ 0.3048006096 meters



  • Slightly longer than the international foot by about 0.0006 millimeters



  • Used primarily in land surveying and legal documents



  • As of recent years, the US has been phasing out the US survey foot in favor of the international foot for standardization.



Though nearly identical to the international foot, the US survey foot remains important for understanding older land records and measurements.



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