Convert Earth's equatorial radius to astronomical unit
Please provide values below to convert Earth's equatorial radius [R_e] to astronomical unit [AU, UA], or Convert astronomical unit to Earth's equatorial radius.
How to Convert Earth's Equatorial Radius to Astronomical Unit
1 R_e = 4.26352124542639e-05 AU, UA
Example: convert 15 R_e to AU, UA:
15 R_e = 15 × 4.26352124542639e-05 AU, UA = 0.000639528186813959 AU, UA
Earth's Equatorial Radius to Astronomical Unit Conversion Table
| Earth's equatorial radius | astronomical unit |
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Earth's Equatorial Radius
The Earth's equatorial radius is the distance from the center of the Earth to the equator, approximately 6,378.1 kilometers.
History/Origin
The size and shape of the Earth have been a subject of study since ancient times. Modern measurements are made using satellite geodesy.
Current Use
The Earth's equatorial radius is a fundamental parameter in geodesy, geophysics, and astronomy. It is used in cartography and for defining the shape of the Earth.
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.