Convert Reed (reed) to Earth's Polar Radius (R⊕ (p)) instantly.
About these units
Reed (reed)
The reed is a smaller unit than the long reed, typically about 1 cubit, and was widely used in Mesopotamia, Egypt, and biblical times. It functioned as a standard measure for construction, religious architecture, and land surveys. Reeds were particularly useful in field work, where repetitive human-scale measurements could be performed quickly. They also served as a practical calibration tool for larger units like rods, chains, and long reeds. The reed is frequently mentioned in ancient texts, highlighting its role in the organization of public works, the construction of sacred buildings, and the measurement of land.
Earth's Polar Radius (R⊕ (p))
The Earth's polar radius is approximately 6,356.8 km, slightly shorter than the equatorial radius due to the Earth's flattening at the poles. This measurement is critical in modeling Earth's shape, gravity field, and rotation. It impacts satellite orbits, geodetic surveys, and global positioning systems (GPS). The difference between the equatorial and polar radii also explains phenomena such as centrifugal force variations, equatorial bulges, and sea level differences across latitudes. Understanding R⊕ (p) is essential for precision navigation, Earth science, and astronomy.