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678 yards per minute is about 0.00000004 times as fast as The Speed of Light
In other words, it's 0.0000000344662439773580 times the speed of The Speed of Light, and the speed of The Speed of Light is 29,013,895.4699250 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 19,671,421,128.6090 yards per minute, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 13,114,280,752.6250 yards per minute when passing through the glass of a typical window.
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