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How fast is 45 miles per second?

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It's about 2,500 times as fast as a Knuckleball (baseball)
In other words, the speed of a Knuckleball (baseball) is 0.00042 times 45 miles per second.
(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 0.019 miles per second. Eddie Cicotte, who was later implicated in the 1919 Black Sox scandal, is credited with developing the pitch ca. 1906.
It's about 3,500 times as fast as a Greyhound
In other words, the speed of a Greyhound is 0.000278 times 45 miles per second.
(a.k.a. English greyhound) (approximate maximum speed)
Greyhounds reach average race speeds of 0.0125 miles per second. Despite their racing prowess, greyhounds are not considered energetic dogs — the typical greyhound race requires the dogs to run for less than 35 seconds.
It's about 4,000 times as fast as a Gazelle
In other words, the speed of a Gazelle is 0.0003 times 45 miles per second.
(for Thomson's Gazelle, a.k.a. Eudorcas thomsoni, a.k.a. "Tommie", a.k.a. "Tommy")
A Thomson's gazelle can reach speeds of up to 0.01 miles per second. The gazelle's speed doesn't match that of its chief predator, the cheetah, but a gazelle's endurance usually ensures an escape in distances greater than 500 m (0.3 mi).
It's about 4,000 times as fast as a Hare
In other words, the speed of a Hare is 0.0003 times 45 miles per second.
(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 0.01 miles per second. 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-four-thousandth as fast as The Speed of Light
In other words, 45 miles per second is 0.00024156871885016 times the speed of The Speed of Light, and the speed of The Speed of Light is 4,139.60882336040 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 186,282.397051220 miles per second, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 124,188.264702890 miles per second when passing through the glass of a typical window.
It's about 4,500 times as fast as Secretariat
In other words, 45 miles per second is 4,310 times the speed of Secretariat, and the speed of Secretariat is 0.000232 times that amount.
(at Belmont Stakes, 1973)
Setting a record finish, Secretariat ran the Belmont Stakes — a 12 furlong race length — in 2:24, for an average speed of 0.0104 miles per second in 1973. His margin of victory in the race, also a record-setter, was 31 lengths.
It's about 7,000 times as fast as Michael Johnson
In other words, 45 miles per second is 6,997 times the speed of Michael Johnson, and the speed of Michael Johnson is 0.0001429 times that amount.
(a.k.a. Michael Duane Johnson) (sprinter; 1967-) (at the Atlanta Olympics, 1996)
Setting a record that stood for 12 years, Michael Johnson ran a 200 m in 0:19.32 for an average speed of 0.006433 miles per second at the 1996 Olympics. Johnson was nicknamed "the Man with the Golden shoes" in recognition of the custom footwear worn during these races — a pair of Nikes with a left size of 10.5 and a right size of 11.