Variations in the Earth's Orbit: Pacemaker of the Ice Ages

@article{Hays1976VariationsIT,
  title={Variations in the Earth's Orbit: Pacemaker of the Ice Ages},
  author={James D. Hays and John Z. Imbrie and Nicholas John Shackleton},
  journal={Science},
  year={1976},
  volume={194},
  pages={1121 - 1132}
}
1) Three indices of global climate have been monitored in the record of the past 450,000 years in Southern Hemisphere ocean-floor sediments. 2) Over the frequency range 10–4 to 10–5 cycle per year, climatic variance of these records is concentrated in three discrete spectral peaks at periods of 23,000, 42,000, and approximately 100,000 years. These peaks correspond to the dominant periods of the earth's solar orbit, and contain respectively about 10, 25, and 50 percent of the climatic variance… 
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