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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:



  • 1 link = 7.92 inches



  • 1 link β‰ˆ 20.1168 cm



  • 25 links = 1 rod (16.5 feet)



  • 100 links = 1 chain (66 feet)



  • 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.


Megameter


A megameter (Mm) is a unit of length in the metric system, equal to 1 million meters (1 Mm = 10⁢ meters or 1,000 kilometers). Megameters are used to measure very large distances, typically on a global or planetary scale. For example, the Earth’s diameter is about 12.7 megameters. Although it’s a valid metric unit, the megameter is rarely used in everyday life or science, as kilometers or other astronomical units are more common for such distances.





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