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7,800 furlongs per fortnight is about 0.000000005 times as fast as The Speed of Light
In other words, it's 0.00000000432704109493640 times the speed of The Speed of Light, and the speed of The Speed of Light is 231,104,807.664120 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 1,802,617,499,780.10 furlongs per fortnight, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 1,201,744,999,873.40 furlongs per fortnight when passing through the glass of a typical window.
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