154.60 yards per hour is about 0.0000000002 times as fast as The Speed of Light.

The speed of light (and all other electromagnetic radiation) in a perfect vacuum is known as "c" and measures exactly 1,180,285,270,000 yards per hour, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 786,856,845,000 yards per hour when passing through the glass of a typical window.

In other words, it's 0.0000000001309852830 times the speed of The Speed of Light, and the speed of The Speed of Light is 7,634,445,470 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 1,180,285,270,000 yards per hour, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 786,856,845,000 yards per hour when passing through the glass of a typical window.