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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.


Famn


A famn (also spelled fathom in English) is a traditional Scandinavian unit of length used primarily for measuring the depth of water or length of ropes and cables. It is roughly equivalent to 6 Swedish feet, which translates to about 1.828 meters (approximately 6 feet).


The famn is similar in concept to the English fathom, based on the span of outstretched arms.


While largely obsolete today, the famn was commonly used in maritime contexts in Norway, Sweden, and Denmark and remains part of historical measurements.


Summary:



  • 1 famn β‰ˆ 1.828 meters (6 feet)



  • Used to measure water depth and rope length



  • Traditional Scandinavian maritime unit



  • Equivalent to the English fathom





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