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See Older Monument to Arctic Circle, Grímsey Island, Iceland
The Arctic Circle currently runs through Grímsey Island. Due to long-term oscillations in the Earth's axis, the Arctic Circle currently shifts northward by about 14.5 metres (48 ft) per year, though varying substantially from year to year due to the complexity of the movement. The true position of the Arctic Circle in the early 21st century is already close to the northern tip of the island, and by about the middle of the 21st century, it will no longer cross Grimsey at all. Originally a fixed monument to the Arctic Circle was placed at a conventional location.
In 2017 a new monument, comprising an eight-tonne stone sphere, was placed close to the true current location of the circle, in response to its continual movement. Also, through the centuries three markers have been placed and marked with the calculated location: 1717, 1817, and 1917.
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