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Correction of errors in explanation.
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This happens notThe 6 months day/night cycle is exactly happening only at the poles (as pointed out in comments). Between the poles and the arctic circle you have a gradual change from 6 month cycle to the 24 hour cycle. Greenland is partially in this area (south Greenland, but anywhere beyond is actually outside the polararctic circle). It is happening because the Earth rotational exis is tilted, so the poles are tilted away from (or towards) the Sun every 6 months under such angle, that the Sun light in certain parts of the year does not get tointo the area beyond the polararctic circle.

See here.

This happens not only in Greenland, but anywhere beyond the polar circle. It is because the Earth rotational exis is tilted, so the poles are tilted away from (or towards) the Sun every 6 months under such angle, that the Sun light does not get to the area beyond the polar circle.

See here.

The 6 months day/night cycle is exactly happening only at the poles (as pointed out in comments). Between the poles and the arctic circle you have a gradual change from 6 month cycle to the 24 hour cycle. Greenland is partially in this area (south Greenland is actually outside the arctic circle). It is happening because the Earth rotational exis is tilted, so the poles are tilted away from (or towards) the Sun every 6 months under such angle, that the Sun light in certain parts of the year does not get into the area beyond the arctic circle.

See here.

Source Link
mpv
mpv
  • 5.3k
  • 3
  • 19
  • 39

This happens not only in Greenland, but anywhere beyond the polar circle. It is because the Earth rotational exis is tilted, so the poles are tilted away from (or towards) the Sun every 6 months under such angle, that the Sun light does not get to the area beyond the polar circle.

See here.