A pole or point that is directly opposite to another pole, especially the opposite pole of a magnet or celestial sphere.
From counter- + pole (from Greek polos, meaning axis or pivot point). The term developed in scientific contexts during the 16th-17th centuries as scientists studied magnetism and astronomy.
The Earth's magnetic North Pole and South Pole are counterpoles, and they actually swap places every 200,000 to 300,000 years—the last reversal was about 780,000 years ago, and birds and whales have to rely on detecting this shift during migration.
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