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Term: Isogonic Line

Description

An isogonic line, also known as an agonic line, is a line on a map or chart connecting points of equal magnetic declination or variation, indicating the difference between the true north and magnetic north directions at a particular location.

Senses

Sense 1: Magnetic Variation

Noun: An isogonic line is used to represent the magnetic variation or declination found at various locations on a map or chart.

Example sentence: The isogonic lines on this chart indicate that at this location, the magnetic north is 10 degrees east of true north.

Sense 2: Cartography

Noun: In cartography, isogonic lines are used to illustrate and understand the magnetic differences across a region.

Example sentence: The maps produced by this cartographer often include isogonic lines for navigational purposes.

Sense 3: Navigation

Noun: Sailors and pilots rely on isogonic lines to adjust their compasses and navigate accurately.

Example sentence: The ship's captain recalibrated the compass using the isogonic line data provided by the navigation system.

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