Convert Nail (Cloth) (nail) to Earth's Polar Radius (R⊕ (p)) instantly.
About these units
Nail (Cloth) (nail)
The nail is another small unit in cloth measurement, roughly 2.1 cm (0.83 inches), sometimes used interchangeably with the finger in English tailoring. The nail allowed fine precision in textile cutting, marking, and assembly. Its practical relevance lay in breaking down larger units like the yard or ell into smaller, manageable increments suitable for artisans. Though obsolete in modern industry, the nail continues to appear in historical accounts, tailoring manuals, and legal documents concerning cloth trade in England.
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.