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Ell


An ell is a historical unit of length that was commonly used in medieval Europe, especially for measuring textiles and cloth. Its length varied by region but was typically about 45 inches (approximately 1.143 meters).


The ell originated from the length of the arm or forearm and was often used by tailors and merchants to measure fabric. Different countries had their own versionsβ€”for example, the English ell was about 45 inches, while the Scottish ell was longer, around 37 inches.


Although obsolete today, the ell played an important role in trade and clothing production before standardized measurements became widespread.


Summary:



  • 1 ell β‰ˆ 45 inches (1.143 meters)



  • Used mainly for measuring cloth and textiles



  • Length varied by region and country



The ell is now largely of historical interest but reflects the origins of many modern measurement systems.



Earth Equatorial Radius


The Earth's equatorial radius is the distance from the center of the Earth to the equator. It represents the Earth's radius measured along the equatorial plane.



  • Its value is approximately 6,378.1 kilometers (about 3,963.2 miles).



  • The Earth is not a perfect sphere but an oblate spheroid, so the equatorial radius is slightly larger than the polar radius.



  • This radius is important for geodesy, satellite orbits, and mapping.



Key facts:



  • Equatorial radius β‰ˆ 6,378.1 km



  • Larger than polar radius due to Earth's flattening at the poles



  • Used in Earth sciences, navigation, and space missions



Understanding the Earth's equatorial radius helps in accurate modeling of the planet’s shape and gravitational field.



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