| 1. | A "'polar circle "'is either the Arctic Circle or the Antarctic Circle.
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| 2. | The party then sailed for home, crossing the Antarctic Circle on 28 February.
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| 3. | The course must include set control points at latitudes outside the Antarctic circles.
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| 4. | It was the first human settlement south of the Antarctic Circle.
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| 5. | This was the first expedition to overwinter within the Antarctic Circle.
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| 6. | Twenty-eight men stranded in the Antarctic Circle for nearly two years?
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| 7. | The ecliptic poles can be at the zenith on the Arctic and Antarctic Circles.
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| 8. | In the process she became the first steam vessel to cross the Antarctic Circle.
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| 9. | Gregorio Portillo flew over the Antarctic Circle in a 15 hours and 30 minutes flight.
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| 10. | Consequently, the Antarctic Circle is currently drifting southwards at a speed of about per year.
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