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How fast is 7,800 furlongs per fortnight?

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It's about one-thirty-thousandth as fast as a Meteor
In other words, the speed of a Meteor is 32,000 times 7,800 furlongs per fortnight.
(formally Meteoroid or meteorite, depending on the context; a.k.a. "shooting star", a.k.a. "falling star")
Small meteoroids enter the Earth's atmosphere at speeds between 67,000,000 furlongs per fortnight and 430,000,000 furlongs per fortnight, depending on their size. The fireball effect, known as ablation, ceases once the atmosphere has slowed the meteoroid to a velocity of about 17,000,000 furlongs per fortnight.
It's about one-seventy-five-thousandth as fast as a bolt of Lightning
In other words, the speed of a bolt of Lightning is 77,000 times 7,800 furlongs per fortnight.
(atmospheric electrical discharge)
A bolt of lightning can travel at up to 580,000,000 furlongs per fortnight when arcing from the atmosphere to the Earth. An estimated 280 million lightning strikes strikes occur each year.
It's about 0.000000005 times as fast as The Speed of Light
In other words, 7,800 furlongs per fortnight is 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.