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How fast is 7,800 furlongs per fortnight?

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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.
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 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-six-thousandth as fast as The Space Shuttle
In other words, 7,800 furlongs per fortnight is 0.00016752 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 5,969.40 times that amount.
(Orbiter vehicle velocity)
The space shuttle orbits at a speed of 46,561,000 furlongs per fortnight. During liftoff, the space shuttle accelerates to orbital speed in 8.5 minutes, consuming over 1.59 million kg (3.51 million lbs) of propellant in the process.
It's about one-seven-hundredth as fast as a Bullet (Rifle)
In other words, 7,800 furlongs per fortnight is 0.00142 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 704 times that amount.
(5.56 x 45 mm, a.k.a. 5.56 NATO)
A 5.56 x 45 mm cartridge is fired at a velocity of 5,500,000 furlongs per fortnight. As the NATO rifle cartridge, it is used by the military forces of more than thirty-one countries, including use in the M16 series, M4 Carbine, HK-416, and M249 Squad automatic weapons used by the United States armed forces.
It's about one-five-hundred-fiftieth as fast as a Jet Fighter
In other words, the speed of a Jet Fighter is 530 times 7,800 furlongs per fortnight.
(for Lockheed Martin F-16, a.k.a. Fighting Falcon, a.k.a. Viper) (maximum speed at altitude)
An F-16's maximum speed at altitude is approximately 4,000,000 furlongs per fortnight. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about one-three-hundredth as fast as a Bullet (Handgun)
In other words, 7,800 furlongs per fortnight is 0.00338 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 296 times that amount.
(for .40 Smith & Wesson 135 grain Sierra JHP, VV 3N37 powder, Fed. 100 primer, Remington case) (muzzle velocity)
A 0.40 caliber Smith & Wesson bullet has a muzzle a velocity of 2,300,000 furlongs per fortnight. This type of ammunition has been the standard issue round of the United States Federal Bureau of Investigation (FBI) since 1990.