51. The Light List indicates that a light has a nominal range of 14 miles and is 42 feet high (12.8 meters). If the visibility is 6 miles and your height of eye is 20 feet (6.1 meters), at what approximate distance will you sight the light?

The light's visibility is limited by both its luminous range in the given visibility (6 nautical miles) and the geographic range due to Earth's curvature. The luminous range is approximately 10 nautical miles, while the geographic range is about 12.8 nautical miles. Therefore, the light will be sighted at approximately 10 nautical miles, which is 10.0 miles.