isogonal line
Definition
Noun: A line on a map or chart that connects points of equal magnetic declination (the angle between magnetic north and true north at a given location). It is also known as an isogonic line.
Usage
The term is used in the specialized fields of cartography, navigation, and geomagnetism to describe a specific type of contour line on maps, particularly nautical or aeronautical charts. * Pilots and navigators consult charts with isogonal lines to correct compass readings for accurate navigation. * The map displayed a dense pattern of isogonal lines converging near the magnetic poles.
Advanced Usage
- The set of isogonal lines on a global chart illustrates the complex and shifting nature of the Earth's magnetic field.
- In geomagnetic studies, the isogonal line of zero declination, where magnetic north and true north align, is specifically called the .
Variants and Related Words
- Isogonic line (noun): A direct synonym for .
- Isogonic (adjective): Pertaining to or having equal angles. For example, "the isogonic chart."
- Agonic line (noun): A specific isogonal line where the magnetic declination is zero.
- Isoclinic line (noun): A related line on a map connecting points of equal magnetic dip (inclination).
Synonyms
- Isogonic line
- Line of equal declination
Related Concepts
- Magnetic declination: The angle that an isogonal line represents.
- Contour line: A general term for a line on a map joining points of equal value. An isogonal line is a type of contour line for magnetic declination.
- Isoline: A broad term for any line on a map connecting points with the same value of a particular quantity. Isogonal lines, isobars, and isotherms are all types of isolines.
Noun
-
an imaginary line connecting points on the Earth's surface where the magnetic declination is the same
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