Convert Fathoms to Light Hours
Convert Fathoms (ftm) to Light Hours (lh) instantly and accurately.
Conversion Formula
lh = ftm × 1.694505604e-12
About Fathoms
A fathom (ftm) is equal to 6 feet or 1.8288 meters, traditionally based on the span of a man's outstretched arms. This unit has been used for centuries in maritime navigation to measure water depth and rope or cable lengths. While largely replaced by meters in modern nautical charts, fathoms remain in use by sailors and in naval traditions. The Mariana Trench, Earth's deepest point, reaches about 6,000 fathoms. The term 'to fathom' meaning 'to understand' derives from this nautical unit.
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
| Fathoms (ftm) | Light Hours (lh) |
|---|---|
| 1 ftm | 1.695 × 10-12 lh |
| 2 ftm | 3.389 × 10-12 lh |
| 5 ftm | 8.473 × 10-12 lh |
| 10 ftm | 1.695 × 10-11 lh |
| 25 ftm | 4.236 × 10-11 lh |
| 50 ftm | 8.473 × 10-11 lh |
| 100 ftm | 1.695 × 10-10 lh |