Convert Sun's Radius to Earth's Equatorial Radius
Convert sun's radii to earth's equatorial radii instantly. 1 sun's radius = 109.0757379467 earth's equatorial radius — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Earth's Equatorial Radius to Sun's Radius converter for the reverse conversion.
Units explained
Sun's Radius
The Sun's radius is approximately 695,700 km (6.957×10⁸ m), defined as the IAU 2015 nominal solar radius for use in stellar physics and exoplanet research.
The IAU (International Astronomical Union) Resolution B3 in 2015 defined a nominal solar radius of exactly 6.957×10⁸ m to serve as a stable reference, independent of actual measurement-uncertainty variations in the real Sun.
Solar radii are used in stellar physics, exoplanet characterisation, and any context where a star's size is expressed relative to the Sun. Most stellar radius measurements are quoted in solar-radius units rather than meters.
Defined exactly at 6.957×10⁸ m by IAU Resolution B3 in 2015.
Earth's Equatorial Radius
Earth's equatorial radius is the distance from the planet's center to its surface at the equator, defined as exactly 6,378,137 meters by the WGS84 geodetic reference system.
The WGS84 (World Geodetic System 1984) defines Earth's reference ellipsoid for use in GPS and global cartography. The 6,378,137 m equatorial value was determined through satellite and ground geodetic measurements consolidated in 1984.
WGS84's equatorial radius is the standard reference for GPS, satellite imagery, geographic information systems, and aviation navigation. It defines the 'a' parameter of Earth's reference ellipsoid in coordinate transformations.
WGS84 reference ellipsoid adopted in 1984 by the US Department of Defense; subsequently adopted globally for GPS and civilian geodesy.
Sun's Radius to Earth's Equatorial Radius conversion formula
The relationship between sun's radii and earth's equatorial radii:
To convert sun's radii to earth's equatorial radii, multiply the value in sun's radii by 109.0757379467. To reverse, multiply earth's equatorial radii by 0.0091679416.
How to use this converter
Type a value into the calculator. The result in earth's equatorial radii updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Earth's Equatorial Radius to Sun's Radius converter for the reverse direction.
Step-by-step: convert sun's radii to earth's equatorial radii
- Write down the value in sun's radii (R☉).
- Multiply that value by the factor 109.0757379467.
- The product is the equivalent value in earth's equatorial radii (R⊕,eq).
- To reverse, multiply the earth's equatorial radius value by 0.0091679416.
Worked examples
Example 1 — Convert 1 R☉ to R⊕,eq:
1 × 109.0757379467 = 109.0757379467 R⊕,eq
Example 2 — Convert 100 R☉ to R⊕,eq:
100 × 109.0757379467 = 10907.5737946676 R⊕,eq
Sun's Radius to Earth's Equatorial Radius conversion table
Standard reference values for converting sun's radii to earth's equatorial radii:
| Sun's Radius [R☉] | Earth's Equatorial Radius [R⊕,eq] |
|---|---|
| 0.01 | 1.0907573795 |
| 0.1 | 10.9075737947 |
| 1 | 109.0757379467 |
| 2 | 218.1514758934 |
| 3 | 327.22721384 |
| 4 | 436.3029517867 |
| 5 | 545.3786897334 |
| 10 | 1090.7573794668 |
| 20 | 2181.5147589335 |
| 30 | 3272.2721384003 |
| 40 | 4363.0295178671 |
| 50 | 5453.7868973338 |
| 100 | 10907.5737946676 |
| 500 | 54537.8689733381 |
| 1000 | 109075.7379466763 |
Frequently asked questions
How many earth's equatorial radii is 1 sun's radius?
How do I convert sun's radii to earth's equatorial radii?
How do I convert earth's equatorial radii back to sun's radii?
How many earth's equatorial radii is 100 sun's radii?
Popular length unit conversions
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Metric / SI (4 units)
Imperial / US Customary (4 units)
Astronomical (8 units)
Sources & references
Conversion factor (1 R☉ = 109.0757379467 R⊕,eq) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.