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How fast is 497.20 yards per minute?

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It's about one-fifteen-thousandth as fast as a bolt of Lightning.
In other words, the speed of a bolt of Lightning is 13,000 times 497.20 yards per minute.
(atmospheric electrical discharge)
A bolt of lightning can travel at up to 6,400,000 yards per minute when arcing from the atmosphere to the Earth. An estimated 280 million lightning strikes strikes occur each year.
It's about 0.00000003 times as fast as The Speed of Light.
In other words, 497.20 yards per minute is 0.00000002527524560 times the speed of The Speed of Light, and the speed of The Speed of Light is 39,564,402.90 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 exactly 19,671,421,100 yards per minute, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 13,114,280,800 yards per minute when passing through the glass of a typical window.
It's about 200,000,000 times as fast as Grass growing.
In other words, 497.20 yards per minute is 190,000,000 times the speed of Grass growing, and the speed of Grass growing is 0.00000000530 times that amount.
(for Kentucky Bluegrass, Poa pratensis) (a.k.a. Smooth Meadow grass, a.k.a. Common Meadow grass) (Summer months, ideal growing conditions)
Kentucky Bluegrass, one of the most common grasses in North America, grows about 0.00000280 yards per minute in the summer months under ideal conditions. When left un-mowed, Kentucky Bluegrass grows to heights of 60 to 90 cm (2 to 3 ft) and blossoms with a blue flower.