The agonic line is a term used in geography to refer to an imaginary line on the Earth’s surface where the magnetic declination is zero. It is an important concept in navigation and is used to determine the true north. In this article, we will explore the definition, origin, meaning, associations, synonyms, antonyms, and examples of agonic line.
Definitions
The agonic line is the line on the Earth’s surface where the magnetic declination is zero. It is also called the magnetic equator or the isogonic line. The magnetic declination is the angle between the true north and the magnetic north. The agonic line is the line where the magnetic north and the true north coincide.
Origin
The term agonic line comes from the Greek word “agon” which means angle or corner. The agonic line was first discovered by Edmund Halley in 1701. He noticed that the magnetic declination was zero in some parts of the world. Later, the agonic line was mapped by Charles Mason and Jeremiah Dixon in the mid-18th century.
Meaning in different dictionaries
According to the Merriam-Webster dictionary, the agonic line is “an imaginary line on the earth’s surface connecting points of zero magnetic declination”. The Oxford dictionary defines it as “the line on the earth’s surface along which the magnetic declination is zero”.
Associations
The agonic line is associated with navigation, cartography, and geography. It is used to determine the true north and to create accurate maps. The agonic line is also associated with the Earth’s magnetic field and the movement of the magnetic north pole.
Synonyms
The synonyms of agonic line are magnetic equator, isogonic line, and zero declination line.
Antonyms
There are no antonyms of agonic line as it is a specific term used in geography and navigation.
The same root words
There are no other words with the same root as agonic line.
Example Sentences
- The agonic line is used in navigation to determine the true north.
- The agonic line is also called the magnetic equator or the isogonic line.
- The agonic line is an important concept in cartography and geography.