Convert Knots to Speed of Light
Convert Knots (kn) to Speed of Light (c) instantly and accurately.
Conversion Formula
c = kn × 1.716001956e-9
About Knots
A knot (kn) = 1 nautical mile per hour = 1,852/3,600 m/s ≈ 0.51444 m/s - the universal speed unit for aviation and maritime navigation (ICAO and IMO standard). GA aircraft cruise 100-140 kn; commercial airliners 450-480 kn; Concorde 1,176 kn (Mach 2). Container ships 18-22 kn; QM2 exceeds 30 kn. Beaufort Force 12 hurricane begins at 64 kn. Gulf Stream surface current 2-4 kn. 1 kn = 1.852 km/h = 1.15078 mph.
About Speed of Light
The speed of light in vacuum (c) = exactly 299,792,458 m/s - the defined SI constant from which the metre is derived (since 1983) and the universal speed limit of causality. Light from the Sun reaches Earth in 8 min 20 s; from the Moon in 1.28 s; from Proxima Centauri in 4.24 years. Mars communication delay 3-22 minutes. In optical fibre (n ≈ 1.467), c/n ≈ 200,000 km/s. GPS clocks must correct for both special and general relativistic effects. c = 299,792,458 m/s.
Quick Reference Table
| Knots (kn) | Speed of Light (c) |
|---|---|
| 1 kn | 1.716 × 10-9 c |
| 2 kn | 3.432 × 10-9 c |
| 5 kn | 8.58 × 10-9 c |
| 10 kn | 1.716 × 10-8 c |
| 25 kn | 4.29 × 10-8 c |
| 50 kn | 8.58 × 10-8 c |
| 100 kn | 1.716 × 10-7 c |