Convert ell to Earth's polar radius
Please provide values below to convert ell [ell] to Earth's polar radius [R_p], or Convert Earth's polar radius to ell.
How to Convert Ell to Earth's Polar Radius
1 ell = 1.79808799534316e-07 R_p
Example: convert 15 ell to R_p:
15 ell = 15 × 1.79808799534316e-07 R_p = 2.69713199301473e-06 R_p
Ell to Earth's Polar Radius Conversion Table
| ell | Earth's polar radius |
|---|
Ell
The ell is an obsolete unit of length, originally used for measuring cloth. Its length varied in different countries, but it was generally around 45 inches.
History/Origin
The word "ell" is derived from the Latin "ulna," meaning "forearm," as the unit was originally based on the length of the forearm.
Current Use
The ell is no longer in use.
Earth's Polar Radius
The Earth's polar radius is the distance from the center of the Earth to the North or South Pole, approximately 6,356.8 kilometers.
History/Origin
The fact that the Earth is an oblate spheroid, flattened at the poles, has been known since the 18th century. Modern measurements are made with high precision.
Current Use
The Earth's polar radius is a key parameter in geodesy and is used to define the Earth's shape and gravitational field.