Convert inch (US survey) to Earth's polar radius
Please provide values below to convert inch (US survey) [in (US)] to Earth's polar radius [R_p], or Convert Earth's polar radius to inch (US survey).
How to Convert Inch (Us Survey) to Earth's Polar Radius
1 in (US) = 3.99575909226477e-09 R_p
Example: convert 15 in (US) to R_p:
15 in (US) = 15 × 3.99575909226477e-09 R_p = 5.99363863839716e-08 R_p
Inch (Us Survey) to Earth's Polar Radius Conversion Table
| inch (US survey) | Earth's polar radius |
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Inch (Us Survey)
The U.S. survey inch is a unit of length equal to 1/12 of a U.S. survey foot.
History/Origin
The U.S. survey inch is based on the U.S. survey foot, which was defined such that 1 meter is exactly 39.37 inches. The use of survey units was officially phased out in 2022.
Current Use
The U.S. survey inch 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.