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    • Earth's axial tilt diagram.
    Rights: National Aeronautics and Space Administration (NASA)Robert Simmon Published 21 June 2007 Size: 41 KB Referencing Hub media

    Earth does not spin absolutely upright, but is tilted on its axis – this is called axial tilt. The degree of tilt changes over about 41,000 years.

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      Astronomical cycles

      Ice caps have come and gone over the Earth’s surface for many millions of years. What has caused the cyclical warming and cooling of our planet. In the 1920s and 1930s, Milutin Milankovitch, a ...

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