Convert Earth Radius to Astronomical Units
Convert Earth Radius (R⊕) to Astronomical Units (AU) instantly and accurately.
Conversion Formula
AU = R⊕ × 4.263496512e-5
About Earth Radius
The Earth radius (R⊕) is approximately 6.371 million meters or 6,371 kilometers, representing the average distance from Earth's center to its surface. Due to Earth's rotation, it's slightly flattened, with the equatorial radius being about 21 km larger than the polar radius. This fundamental measurement is crucial in geology, geography, and astronomy for calculating Earth's circumference (about 40,000 km), surface area, and volume. It's also used as a comparative unit for describing other planets and exoplanets.
About Astronomical Units
An astronomical unit (AU) is the average distance between Earth and the Sun, precisely defined as 149,597,870.7 kilometers. This unit provides a convenient scale for measuring distances within our solar system. Mars orbits at 1.5 AU, Jupiter at 5.2 AU, and Neptune at about 30 AU from the Sun. The dwarf planet Pluto reaches up to 49 AU away. Light takes about 8.3 minutes to travel 1 AU, explaining why we see the Sun as it was 8 minutes ago. The AU is fundamental in astronomy and space exploration.
Quick Reference Table
| Earth Radius (R⊕) | Astronomical Units (AU) |
|---|---|
| 1 R⊕ | 4.263 × 10-5 AU |
| 2 R⊕ | 8.527 × 10-5 AU |
| 5 R⊕ | 0.000213175 AU |
| 10 R⊕ | 0.00042635 AU |
| 25 R⊕ | 0.00106587 AU |
| 50 R⊕ | 0.00213175 AU |
| 100 R⊕ | 0.0042635 AU |