EVERYDAY SCIENCE

Detailed explanation-1: -A marine chronometer is a precision timepiece that is carried on a ship and employed in the determination of the ship’s position by celestial navigation. It is used to determine longitude by comparing Greenwich Mean Time (GMT), and the time at the current location found from observations of celestial bodies.

Detailed explanation-2: -Chronometer is an instrument for measuring time accurately in spite of motion or variations in temperature, humidity, and air pressure.So it can be used a a clock for determining the longitude of a vessel at sea.

Detailed explanation-3: -A marine chronometer is a portable device that is used to determine the precise and accurate time at any given moment. It is also used to determine the longitude as time corresponds to a fixed location.

Detailed explanation-4: -sextant, instrument for determining the angle between the horizon and a celestial body such as the Sun, the Moon, or a star, used in celestial navigation to determine latitude and longitude. The device consists of an arc of a circle, marked off in degrees, and a movable radial arm pivoted at the centre of the circle.

Detailed explanation-5: -1. a timepiece or timing device with a special mechanism for ensuring and adjusting its accuracy, for use in determining longitude at sea or for any purpose where very exact measurement of time is required. 2. any timepiece, esp. a wristwatch, designed for the highest accuracy.