Latitude runs east to west and measures distance north and south of the equator. Longitude runs north to south and measures distance east and west of the prime meridian. The point directly opposite Miami, Florida, which is at 26°N 80°W, would be at 26°S 100°E in the Indian Ocean. While digging a hole to China from the United States would not actually work, since the US and China are in different hemispheres.