Convert Speed of Light to Knots
Convert Speed of Light (c) to Knots (kn) instantly and accurately.
Conversion Formula
kn = c × 582749918.4
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.
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.
Quick Reference Table
| Speed of Light (c) | Knots (kn) |
|---|---|
| 1 c | 582750000 kn |
| 2 c | 1.165 × 109 kn |
| 5 c | 2.914 × 109 kn |
| 10 c | 5.827 × 109 kn |
| 25 c | 1.457 × 1010 kn |
| 50 c | 2.914 × 1010 kn |
| 100 c | 5.827 × 1010 kn |