Etymology:
The word "agonic" is derived from the Greek word "agōnia," which means "contest" or "struggle."
Meaning:
Origin:
The word "agonic" first appeared in English in the mid-16th century. It was borrowed from the Latin "agonicus," which was in turn derived from the Greek "agōnia." The term was originally used to describe people or situations involved in a contest or struggle.
Over time, the term "agonic" came to be used in the context of magnetism. In the 17th century, scientists discovered that the magnetic compass needle does not always point true north. This deviation from true north is known as magnetic declination. In certain locations on Earth, the magnetic declination is zero, meaning that the compass needle points directly to true north. These locations are known as agonic lines or agonic points.
The use of the term "agonic" in the context of magnetism is due to the fact that the magnetic field of the Earth is constantly changing, and as a result, the agonic lines are constantly shifting. This means that the locations where the magnetic declination is zero are constantly changing, and scientists must不断地进行测量和更新agonic chart。
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