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Terameter (Tm) as a Unit of Length

A terameter, abbreviated as Tm, is a unit of length in the metric system, equal to 1 trillion meters (1 Tm = 1,000,000,000,000 meters or 10¹² meters). It is an extremely large unit that is not commonly used in everyday measurements but can be useful in astronomy and space science when dealing with vast distances.

For perspective, the average distance from Earth to the Sun is about 149.6 million kilometers, or 0.0001496 terameters. So even astronomical distances are often less than one terameter. This shows how massive the unit is.

Because of its size, the terameter is rarely seen outside of theoretical or highly specialized scientific contexts. More commonly used large units in space science include the astronomical unit (AU), light-year, and parsec.

In summary, the terameter is a powerful way to express extremely large distances, especially on a cosmic scale.

Link

A link is a traditional unit of length used primarily in land surveying. It is defined as exactly 7.92 inches or approximately 20.1168 centimeters.

The link originated from Gunter's chain, a 66-foot measuring device introduced in 1620 by English mathematician Edmund Gunter. This chain was divided into 100 equal parts, each measuring one link. The link became a standard unit in English-speaking countries for surveying and land measurement.

Key Facts:

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  1 link = 7.92 inches

  
  
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  1 link ≈ 20.1168 cm

  
  
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  25 links = 1 rod (16.5 feet)

  
  
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  100 links = 1 chain (66 feet)

  
  
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  1,000 links = 1 furlong (660 feet)

  
  

While the link has largely fallen out of general use, it remains a part of historical surveying practices and is still referenced in some legal and cadastral documents.