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How fast is 7,800 furlongs per fortnight?

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It's about one-fifteenth as fast as a Hare
In other words, the speed of a Hare is 20 times 7,800 furlongs per fortnight.
(for European Brown Hare, a.k.a. Brown Hare, a.k.a. Lepus europaeus, a.k.a. Brown Hare)
The European Hare can run at speeds of up to 100,000 furlongs per fortnight. While speed is a factor in their escapes, hares evade their chief predators — wolves, foxes, and golden eagles — by fleeing in a zigzag pattern.
It's about one-twenty-fifth as fast as a Knuckleball (baseball)
In other words, the speed of a Knuckleball (baseball) is 23 times 7,800 furlongs per fortnight.
(a.k.a. knuckler, a.k.a. floater, a.k.a. dancer, a.k.a. butterfly ball) (major league average)
The average speed of major league knuckleball pitch is 180,000 furlongs per fortnight. Eddie Cicotte, who was later implicated in the 1919 Black Sox scandal, is credited with developing the pitch ca. 1906.
It's about one-twenty-fifth as fast as a Cheetah
In other words, 7,800 furlongs per fortnight is 0.04227 times the speed of a Cheetah, and the speed of a Cheetah is 23.660 times that amount.
(Acinonyx jubatus)
The cheetah can reach speeds of up to 184,600 furlongs per fortnight in short bursts. From a crouching position, the cheetah can attain these speeds in just 2.25 seconds.
It's about one-twenty-fifth as fast as a Hurricane
In other words, the speed of a Hurricane is 25.50 times 7,800 furlongs per fortnight.
(formally: Topical cyclone; a.k.a. typhoon)
A hurricane is defined by the US National Hurricane Center as a Northern Hemisphere tropical storm having one-minute average wind-speeds of at least 199,000 furlongs per fortnight. Typhoons Tip (October, 1979) and Keith (October, 1997) and Hurricanes Camille (August, 1969) and Allen (August, 1980) jointly hold the record for highest tropical storm wind speeds at 518,000 furlongs per fortnight.
It's about one-twenty-fifth as fast as a Curveball (baseball)
In other words, the speed of a Curveball (baseball) is 26 times 7,800 furlongs per fortnight.
(a.k.a. hook, a.k.a. hammer, a.k.a. yakker) (major league average)
The average speed of major league curveball pitch is 200,000 furlongs per fortnight. In the 1940's, debate over whether there really was a curve in the curveball pitch was settled with the conclusion that the ball does curve; however, an optical illusion caused by the spin of the ball and the batter's perception of motion exaggerates the extent of the curve.
It's about one-thirtieth as fast as a Fastball (baseball)
In other words, the speed of a Fastball (baseball) is 31 times 7,800 furlongs per fortnight.
(a.k.a. rising fastball, a.k.a. cross-seam fastball, a.k.a. heater, a.k.a. hummer, a.k.a. smoker; for four-seam grip) (major league average)
The average speed of major league fastball pitch is 250,000 furlongs per fortnight. When up against the quickest professional fastball pitchers, a batter may have less than 0.4 seconds to react to a pitched ball.
It's about one-fortieth as fast as a Skydiver (belly-to-earth)
In other words, the speed of a Skydiver (belly-to-earth) is 42 times 7,800 furlongs per fortnight.
(Belly-to-Earth orientation, average conditions, terminal velocity)
A belly-to-Earth oriented skydiver's terminal velocity is about 320,000 furlongs per fortnight. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 60 seconds.