Convert foot (US survey) to Earth's polar radius
Please provide values below to convert foot (US survey) [ft (US)] to Earth's polar radius [R_p], or Convert Earth's polar radius to foot (US survey).
How to Convert Foot (Us Survey) to Earth's Polar Radius
1 ft (US) = 4.79491091071773e-08 R_p
Example: convert 15 ft (US) to R_p:
15 ft (US) = 15 Γ 4.79491091071773e-08 R_p = 7.19236636607659e-07 R_p
Foot (Us Survey) to Earth's Polar Radius Conversion Table
foot (US survey) | Earth's polar radius |
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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.
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.