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Correction for the speed of a bolt of Lightning

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How fast is 430,000,000 furlongs per fortnight?
It's about three-fourths as fast as a bolt of Lightning
The speed of a bolt of Lightning is about 590,000,000 furlongs per fortnight.
(atmospheric electrical discharge)
A bolt of lightning can travel at up to 580,000,000 furlongs per fortnight when arcing from the atmosphere to the Earth. An estimated 280 million lightning strikes strikes occur each year.
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