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474 knots is about one-four-hundredth as fast as a bolt of Lightning.
In other words, it's 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.
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