Glass

In maritime context, glass refers to a navigational instrument used for measuring the angle between the horizon and celestial bodies such as the sun, moon, and stars. This angle, known as the altitude, is used to determine the ship's position on the earth. The glass consists of a telescope mounted on a graduated arc, which can be adjusted to measure the altitude of the celestial body. The glass is an essential tool for celestial navigation, which is still used by some mariners today, particularly in emergency situations when electronic navigation systems fail.
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