Earth's Equatorial Radius to Astronomical Unit Conversion
Convert between Earth's Equatorial Radius and Astronomical Unit quickly and accurately.
How to Convert Earth's Equatorial Radius to Astronomical Unit
Conversion Formula
Example
Convert 15 R⊕ to AU:
Unit Information
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Earth's Equatorial Radius
R⊕
Definition
Earth's equatorial radius (symbol: R⊕) is a unit of length used in astronomy and geophysics, equal to the radius of Earth at the equator. It is approximately 6,378 kilometers (3,963 miles). This unit is used as a reference for measuring distances in space and planetary science.
History/Origin
Earth's equatorial radius was first accurately measured by Eratosthenes in ancient Greece using geometric methods. Modern measurements use satellite geodesy and radar ranging. The current value is precisely determined through international cooperation and advanced measurement techniques.
Current Use
Earth's equatorial radius is used in astronomy for expressing distances to planets and moons, in space mission planning, and in planetary science for comparing the sizes of celestial bodies. It serves as a fundamental reference unit in space exploration and astrophysics.
Multiplier
6378160
Offset
0
Astronomical Unit
AU
Definition
An astronomical unit (symbol: AU) is a unit of length used in astronomy, equal to the average distance between Earth and the Sun. It is approximately 149.6 million kilometers (93 million miles). The AU is the standard unit for measuring distances within the solar system.
History/Origin
The astronomical unit was first estimated by ancient astronomers using observations of planetary positions. The modern value was determined through radar measurements of Venus and Mercury in the 1960s. It was redefined in 2012 to be exactly 149,597,870,700 meters.
Current Use
The astronomical unit is used throughout astronomy for measuring distances within the solar system, planetary orbits, and spacecraft trajectories. It is essential for space mission planning, planetary science, and understanding the scale of our solar system.
Multiplier
149597870691
Offset
0
Earth's Equatorial Radius to Astronomical Unit Conversion Table
| Earth's Equatorial Radius [R⊕] | Astronomical Unit [AU] |
|---|---|
| 1 R⊕ | 0.000043 AU |
| 10 R⊕ | 0.000426 AU |
| 25 R⊕ | 0.001066 AU |
| 50 R⊕ | 0.002132 AU |
| 100 R⊕ | 0.004264 AU |
| 0 R⊕ | 0E+0 AU |
| -10 R⊕ | -0.000426 AU |
| -40 R⊕ | -0.001705 AU |
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