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Long Cubit

The long cubit is an ancient unit of length that is a variation of the standard cubit, measuring from the elbow to the tip of the middle finger. The long cubit is longer than the common cubit, typically about 21 inches (approximately 53 centimeters).

It was used in ancient civilizations such as Egypt and Mesopotamia for construction, land measurement, and crafts, especially when more precision or a larger unit was needed.

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  Long cubit ≈ 21 inches (53 cm)

  
  
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  Longer than the standard cubit (usually about 18 inches)

  
  
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  Used in ancient architecture and surveying

  
  
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  Provided a larger base unit for measurements in construction

  
  

The long cubit helped ancient builders and surveyors manage larger scales while still relying on the human body as a reference.

Megameter

A megameter (Mm) is a unit of length in the metric system, equal to 1 million meters (1 Mm = 10⁶ 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.