Convert long reed to Earth polar radius Online | Free Length Converter

Long Reed

The long reed is an old English unit of length used primarily in measuring land, especially in agriculture and surveying. It is traditionally equal to 16.5 feet or 5.03 meters.

The long reed was used alongside other units like the rod, pole, and perch, often interchangeably, to measure distances and plot boundaries.

Key points:

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  1 long reed = 16.5 feet ≈ 5.03 meters

  
  
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  Used historically in land measurement and agriculture

  
  
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  Equivalent or similar to the rod, pole, or perch

  
  
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  Important in English customary measurement systems

  
  

Though obsolete now, the long reed is part of the rich history of traditional English measurement units.

Earth Polar Radius

The Earth's polar radius is the distance from the center of the Earth to the North or South Pole. It measures the Earth’s radius along its rotational axis.

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  Its value is approximately 6,356.8 kilometers (about 3,949.9 miles).

  
  
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  The Earth is an oblate spheroid, so the polar radius is slightly shorter than the equatorial radius due to the planet's flattening at the poles.

  
  
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  This measurement is crucial for geodesy, understanding Earth’s shape, and satellite navigation.

  
  

Key facts:

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  Polar radius ≈ 6,356.8 km

  
  
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  Smaller than equatorial radius by about 21.3 km

  
  
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  Important for precise Earth modeling and mapping

  
  

The difference between the polar and equatorial radius reflects the Earth’s rotation and its effect on the planet’s shape.