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As the Earth revolves around the sun, the axial tilt remains the same, so in the Northern hemisphere Polaris- the north star- will be fixed above geographic north. Although the Earth’s axial tilt doesn’t change, the orientation of the north and south hemispheres relative to the sun changes during its orbit and causes seasons. Summer occurs when a hemisphere is tilted towards the sun, whereas winter occurs when the hemisphere is tilted away from the sun.
At the poles, summer and winter take on a new meaning. When the northern hemisphere is i
nclined toward the sun- summer in the northern hemisphere- the north pole and all latitudes north of N 66.5º experience 24 hours of sunlight while the south pole and all latit
udes south of S 66.5º experience winter and 24 hours of darkness.
Our visit to McMurdo Station is November - January. During these months, the southern hemisphere is inlined towards the sun. McMurdo is at S 77.51º so for our stay the sun will never set.