Convert a.u. of length to Earth polar radius Online | Free Length Converter

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:

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  1 astronomical unit ≈ 149,597,870.7 kilometers (about 93 million miles)

  
  
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  Used to measure distances between planets and other objects in the solar system

  
  
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  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.

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.