Ambivalent Skeptic

March 4, 2011

Perspective on speed and “standing still”

Filed under: Perspective,Science — Clint1911 @ 10:03 pm

25000 mi / 24 hr = 1041.66… MPH

Earth’s Circumference at the Equator: 24901.55 miles (40075.16 km).

Those roughly 25,000 miles pass by in 24 hours, at a speed of 25000/24 or just over 1000 miles per hour.

Multiply the planet’s circumference by the cosine of your latitude to see how fast the Earth is rotating where you are.

cosine(31 degrees) * (25,000 / 24) = 892.882605
cosine(39 degrees) * (25,000 / 24) = 809.527043
cosine(41 degrees) * (25,000 / 24) = 786.155813
cosine(40 degrees) * (25,000 / 24) = 797.962962
cosine(49 degrees) * (25,000 / 24) = 683.394822

1 MPH = 1.46666… fps
100 MPH = 146.7 fps

So at 41 degrees North, the dirt under my feet is spinning around the Earth’s axis at 1153.029 fps.

That’s fast. That’s faster than most commercial airliners. It’s even faster than many pistol bullets.

Even better….

The Earth is also moving around the Sun at about 67,000 miles per hour.

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