Convert Earth's Equatorial Radius to Sun's Radius
Convert earth's equatorial radii to sun's radii instantly. 1 earth's equatorial radius = 0.0091679416 sun's radius — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Sun's Radius to Earth's Equatorial Radius converter for the reverse conversion.
Units explained
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
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 to Sun's Radius conversion formula
The relationship between earth's equatorial radii and sun's radii:
To convert earth's equatorial radii to sun's radii, multiply the value in earth's equatorial radii by 0.0091679416. To reverse, multiply sun's radii by 109.0757379467.
How to use this converter
Type a value into the calculator. The result in sun's 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 Sun's Radius to Earth's Equatorial Radius converter for the reverse direction.
Step-by-step: convert earth's equatorial radii to sun's radii
- Write down the value in earth's equatorial radii (R⊕,eq).
- Multiply that value by the factor 0.0091679416.
- The product is the equivalent value in sun's radii (R☉).
- To reverse, multiply the sun's radius value by 109.0757379467.
Worked examples
Example 1 — Convert 1 R⊕,eq to R☉:
1 × 0.0091679416 = 0.0091679416 R☉
Example 2 — Convert 100 R⊕,eq to R☉:
100 × 0.0091679416 = 0.9167941642 R☉
Earth's Equatorial Radius to Sun's Radius conversion table
Standard reference values for converting earth's equatorial radii to sun's radii:
| Earth's Equatorial Radius [R⊕,eq] | Sun's Radius [R☉] |
|---|---|
| 0.01 | 9.167942e-5 |
| 0.1 | 0.0009167942 |
| 1 | 0.0091679416 |
| 2 | 0.0183358833 |
| 3 | 0.0275038249 |
| 4 | 0.0366717666 |
| 5 | 0.0458397082 |
| 10 | 0.0916794164 |
| 20 | 0.1833588328 |
| 30 | 0.2750382492 |
| 40 | 0.3667176657 |
| 50 | 0.4583970821 |
| 100 | 0.9167941642 |
| 500 | 4.5839708208 |
| 1000 | 9.1679416415 |
Frequently asked questions
How many sun's radii is 1 earth's equatorial radius?
How do I convert earth's equatorial radii to sun's radii?
How do I convert sun's radii back to earth's equatorial radii?
How many sun's radii is 100 earth's equatorial radii?
Popular length unit conversions
Convert Earth's Equatorial Radius to other length units
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Metric / SI (4 units)
Imperial / US Customary (4 units)
Astronomical (8 units)
Sources & references
Conversion factor (1 R⊕,eq = 0.0091679416 R☉) 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.