Planetary · Solar system
Earth
12,742 kmOur ocean world, measured by mean diameter — the anchor for familiar planetary comparisons.
Planetary ↔ Planetary
How large is the Moon compared with Earth?
The Moon looks similar in size to the Sun from Earth, but its physical diameter is a fraction of our planet’s.
Linear ratio3.667×
Using the stated linear measurements, Earth is 3.667× The Moon.
Planetary · Solar system
The Moon
3,474.8 kmEarth’s natural satellite, the only world beyond Earth visited by humans.
The answer
A ratio, an analogy and the definitions behind both.
Using the stated linear measurements, Earth is 3.667× The Moon.
About 3.667× The Moon linear spans fit across the selected measurement of Earth.
mean diameter versus mean diameter
Both entries use compatible measurement definitions, making the ratio especially direct.
Earth is measured; the Moon is measured.
Representative, variable and model-dependent values are useful for perspective only when their status remains visible.
Measurement ledger
What exactly was divided?
| Landmark | Value | Measurement | Certainty | Source |
|---|---|---|---|---|
| Earth | 12,742 km | mean diameter | Measured | NASA Science ↗ |
| The Moon | 3,474.8 km | mean diameter | Measured | NASA Science ↗ |