[Illustrations, footnotes and references available in PDF version]
The study of extraterrestrial climatic forcing factors is primarily a study of phenomena related to the Sun. Historically, this field of inquiry began with the work of Milankovitch (1920, 1941), who linked the cyclical glaciations of the past million years to the receipt of solar radiation at the surface of the Earth as modulated by variations in Earth's orbit and rotational characteristics. Subsequent investigations implicated a number of other solar phenomena that operate on both shorter and longer timescales; and this summary reviews the findings of the subset of those studies that involve galactic cosmic rays (GCRs).
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