Aberystwyth at 633 mph?

What's this? A new land speed record? No, it's speed at the circumference of the earth as it rotates once every 24 hours.

The circumference of the earth at the equator is approx 24,000 miles giving a speed of 1000 miles at the equator. Using a cosine equation and putting in Aberystwyth's latitude of 52.4N we get 633 mph.

Equation:

circumference = 2 x Pi x R x Cos(Pi x 52.4/180) where R = radius of the earth = 3963 miles

Source: Ask A Scientist