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474 knots is about 0.0000008 times as fast as The Speed of Light.
In other words, it's 0.000000813384927337520 times the speed of The Speed of Light, and the speed of The Speed of Light is 1,229,430.20750750 times that amount.
(C) (in a vacuum)
The speed of light (and all other electromagnetic radiation) in a perfect vacuum is known as "c" and measures 582,749,918.358530 knots, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 388,499,945.578830 knots when passing through the glass of a typical window.
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