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Nature 427, 686-687 (19 February 2004) |

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Palaeoclimate: Low-down on a rhythmic high

Katharina Billups1

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Changes in the amount of solar energy reaching Earth account for certain climate cycles at high and low latitudes. Surprisingly, the effects of a high-latitude cycle evidently reached into the tropics.

During the 1920s, Milutin Milankovitch, a Serbian mathematician, calculated the effects of alterations in Earth's motion around the Sun on the amount of solar energy reaching different latitudes1. Since then, some of the long-period, cyclic changes seen in archives of past environmental conditions on Earth have been explained by these changes in insolation.

  1. Katharina Billups is at the College of Marine Studies, University of Delaware, 700 Pilottown Road, Lewes, Delaware 19958, USA.
    Email: kbillups@udel.edu

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