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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.



Yard


A yard is a unit of length used mainly in the United States, the United Kingdom, and some other countries. One yard equals 3 feet or 36 inches, which is about 0.91 meters. Yards are often used to measure things like fabric, sports fields, or short distances. For example, an American football field is 100 yards long. The abbreviation for yard is "yd". While the metric system is widely used worldwide, yards are still common in everyday life and certain industries in countries that use the imperial system.



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