Convert Earth's polar radius to astronomical unit
Please provide values below to convert Earth's polar radius [R_p] to astronomical unit [AU, UA], or Convert astronomical unit to Earth's polar radius.
How to Convert Earth's Polar Radius to Astronomical Unit
1 R_p = 4.24922645640303e-05 AU, UA
Example: convert 15 R_p to AU, UA:
15 R_p = 15 × 4.24922645640303e-05 AU, UA = 0.000637383968460455 AU, UA
Earth's Polar Radius to Astronomical Unit Conversion Table
| Earth's polar radius | astronomical unit |
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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.
Astronomical Unit
The astronomical unit is a unit of length, now defined as exactly 149,597,870,700 meters. It is approximately the average distance between the Earth and the Sun.
History/Origin
Historically, the astronomical unit was the mean Earth-Sun distance. In 2012, the International Astronomical Union (IAU) redefined it as a fixed constant.
Current Use
The astronomical unit is used primarily for measuring distances within the Solar System or around other stars.