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543 miles per second is about one-three-hundred-fiftieth as fast as The Speed of Light.
In other words, it's 0.00291492921 times the speed of The Speed of Light, and the speed of The Speed of Light is 343.061504 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 exactly 186,282.3970 miles per second, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 124,188.2650 miles per second when passing through the glass of a typical window.
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