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.
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:
1 long reed = 16.5 feet ≈ 5.03 meters
Used historically in land measurement and agriculture
Equivalent or similar to the rod, pole, or perch
Important in English customary measurement systems
Though obsolete now, the long reed is part of the rich history of traditional English measurement units.
No conversions available for length.