The earth’s curved surface means that objects are moving at very different speeds depending on their latitude: At the equator (latitude 0°), an object is moving at a speed of about 1700 km/hr.
	At the pole (latitude 90°), an object moving hardly at all due to the earth’s rotation. Here in Los Angeles (latitude 34°N), an object is moving at a speed of about 1400 km/hr (=860 miles/hr!).