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How fast is 0.00000016402810 times the speed of light?

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It's about nine-tenths as fast as a Skydiver (belly-to-earth).
In other words, 0.00000016402810 times the speed of light is 0.930 times the speed of a Skydiver (belly-to-earth), and the speed of a Skydiver (belly-to-earth) is 1.10 times that amount.
(Belly-to-Earth orientation, average conditions, terminal velocity)
A belly-to-Earth oriented skydiver's terminal velocity is about 0.000000180 times the speed of light. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 60 seconds.
It's about nine-tenths as fast as a Tornado.
In other words, 0.00000016402810 times the speed of light is 0.8906880 times the speed of a Tornado, and the speed of a Tornado is 1.1227280 times that amount.
(EF2) (wind speed range average)
According to the Enhanced Fujita scale implemented by the US National Oceanographic and Atmospheric Administration, a "significant" tornado has an Enhanced Funjita scale classification of EF2 and is characterized by wind gust speeds between 0.00000016402810 times the speed of light and 0.00000020428960 times the speed of light. The largest recorded tornado — an F4 event occurring in Nebraska in May, 2004 — was almost 4.02 km (2.5 mi) across.
It's about one-and-one-fifth times as fast as a Fastball (baseball).
In other words, the speed of a Fastball (baseball) is 0.830 times 0.00000016402810 times the speed of light.
(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 0.000000140 times the speed of light. 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-and-two-fifths times as fast as a Curveball (baseball).
In other words, the speed of a Curveball (baseball) is 0.710 times 0.00000016402810 times the speed of light.
(a.k.a. hook, a.k.a. hammer, a.k.a. yakker) (major league average)
The average speed of major league curveball pitch is 0.000000110 times the speed of light. 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 two-thirds as fast as a Skydiver (headfirst).
In other words, the speed of a Skydiver (headfirst) is 1.50 times 0.00000016402810 times the speed of light.
(Head-to-Earth orientation or standing, average conditions, terminal velocity)
A head-to-Earth or standing-oriented skydiver's terminal velocity assuming average conditions is about 0.000000240 times the speed of light. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 46 seconds.
It's about one-and-a-half times as fast as a Hurricane.
In other words, 0.00000016402810 times the speed of light is 1.490 times the speed of a Hurricane, and the speed of a Hurricane is 0.6710 times that amount.
(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 0.000000110 times the speed of light. 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 0.0000002870 times the speed of light.
It's about one-and-three-fifths times as fast as a Knuckleball (baseball).
In other words, the speed of a Knuckleball (baseball) is 0.630 times 0.00000016402810 times the speed of light.
(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 0.0000001000 times the speed of light. Eddie Cicotte, who was later implicated in the 1919 Black Sox scandal, is credited with developing the pitch ca. 1906.