Convert Earth's polar radius to foot (US survey)
Please provide values below to convert Earth's polar radius [R_p] to foot (US survey) [ft (US)], or Convert foot (US survey) to Earth's polar radius.
How to Convert Earth's Polar Radius to Foot (Us Survey)
1 R_p = 20855444.8376668 ft (US)
Example: convert 15 R_p to ft (US):
15 R_p = 15 × 20855444.8376668 ft (US) = 312831672.565001 ft (US)
Earth's Polar Radius to Foot (Us Survey) Conversion Table
| Earth's polar radius | foot (US survey) |
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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.
Foot (Us Survey)
The U.S. survey foot was a unit of length defined as exactly 1200/3937 meters.
History/Origin
The U.S. survey foot was used for land surveying in the United States for most of the 20th century. Its use was officially phased out in 2022 to standardize with the international foot.
Current Use
The U.S. survey foot is now an obsolete unit.