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(from: Arctic Circle)
The Arctic Circle marks the southern extremity of the solar day of the summer solstice and the solar night of the winter solstice. Within the Arctic Circle, the arctic Sun is above the horizon for at least 24 continuous hours per year, in conjunction with the Arctic's Summer Solstice. Likewise, in conjunction with the Arctic's Winter Solstice, the Arctic sun will be below the horizon for at least 24 continuous hours.