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How fast is 474 knots?

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It's about 0.0000008 times as fast as The Speed of Light.
In other words, 474 knots is 0.000000813384927337520 times the speed of The Speed of Light, and the speed of The Speed of Light is 1,229,430.20750750 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 582,749,918.358530 knots, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 388,499,945.578830 knots when passing through the glass of a typical window.
It's about one-four-hundredth as fast as a bolt of Lightning.
In other words, 474 knots is 0.0025 times the speed of a bolt of Lightning, and the speed of a bolt of Lightning is 400 times that amount.
(atmospheric electrical discharge)
A bolt of lightning can travel at up to 190,000 knots when arcing from the atmosphere to the Earth. An estimated 280 million lightning strikes strikes occur each year.
It's about one-one-hundred-fiftieth as fast as a Meteor.
In other words, the speed of a Meteor is 170 times 474 knots.
(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 22,000 knots and 140,000 knots, depending on their size. The fireball effect, known as ablation, ceases once the atmosphere has slowed the meteoroid to a velocity of about 5,400 knots.
It's about one-thirtieth as fast as The Space Shuttle.
In other words, 474 knots is 0.03149 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 31.7560 times that amount.
(Orbiter vehicle velocity)
The space shuttle orbits at a speed of 15,052 knots. 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-fourth as fast as a Bullet (Rifle).
In other words, 474 knots is 0.2660 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 3.760 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 1,780 knots. 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-third as fast as a Jet Fighter.
In other words, the speed of a Jet Fighter is 2.80 times 474 knots.
(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 nan knots. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about two-thirds as fast as a Bullet (Handgun).
In other words, 474 knots is 0.6350 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 1.570 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 745 knots. This type of ammunition has been the standard issue round of the United States Federal Bureau of Investigation (FBI) since 1990.