Convert Earth Radius to Light Hours
Convert Earth Radius (R⊕) to Light Hours (lh) instantly and accurately.
Conversion Formula
lh = R⊕ × 5.909736543e-6
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 Light Hours
A light hour (lh) is the distance light travels in one hour through a vacuum, approximately 1.08 billion kilometers. Jupiter is about 0.72 light hours from the Sun, while Saturn orbits at roughly 1.3 light hours. This unit is useful for expressing distances to the outer planets and understanding communication delays with spacecraft. A radio signal to a probe near Jupiter takes about 43 minutes to arrive, representing the vast scales even within our solar system. Pluto at its farthest reaches about 5.5 light hours from the Sun.
Quick Reference Table
| Earth Radius (R⊕) | Light Hours (lh) |
|---|---|
| 1 R⊕ | 5.91 × 10-6 lh |
| 2 R⊕ | 1.182 × 10-5 lh |
| 5 R⊕ | 2.955 × 10-5 lh |
| 10 R⊕ | 5.91 × 10-5 lh |
| 25 R⊕ | 0.000147743 lh |
| 50 R⊕ | 0.000295487 lh |
| 100 R⊕ | 0.000590974 lh |