If you stand at the equator, the celestial poles (the points in the sky directly above the North and South poles) lie on the horizon. As you move northward, the northern celestial pole gradually rises above the horizon, so the sky is in effect tilted. The ancient Greeks called this tilt klima, literally “slope,” “inclination.” Because the angle is determined by your latitude, klima came to mean “latitude,” and the earth was divided into seven latitudinal regions, called klimata. The word came into modern European languages as clime or climate, and the weather of a region was also called climate.