Earth's Fast Spin: Why 15° Takes An Hour?

Many people confuse linear speed (kilometers per hour) with angular speed (degrees per hour). The Earth's linear speed at the equator (~1670km/h) refers to how fast a point on the surface travels. However, the entire planet rotates 360 degrees in 24 hours. This means it rotates 15 degrees every hour (360 / 24 = 15). The high linear speed simply means that to cover those 15 degrees, a point on the equator travels a significant distance very quickly. The time it takes to cover a specific angle is determined by the constant angular velocity of the entire sphere.