Convert chain (US survey) to Earth's polar radius
Please provide values below to convert chain (US survey) [ch (US)] to Earth's polar radius [R_p], or Convert Earth's polar radius to chain (US survey).
How to Convert Chain (Us Survey) to Earth's Polar Radius
1 ch (US) = 3.16464120108943e-06 R_p
Example: convert 15 ch (US) to R_p:
15 ch (US) = 15 × 3.16464120108943e-06 R_p = 4.74696180163415e-05 R_p
Chain (Us Survey) to Earth's Polar Radius Conversion Table
| chain (US survey) | Earth's polar radius |
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Chain (Us Survey)
A U.S. survey chain is a unit of length equal to 66 U.S. survey feet.
History/Origin
The U.S. survey chain is based on the U.S. survey foot, which was slightly different from the international foot. The use of survey units was officially phased out in 2022.
Current Use
The U.S. survey chain was used for land surveying in the United States.
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.