evidence: Hays, J. D., Imbrie, J. & Shackleton, N. J. J. Variations in the Earth’ s orbit: pacemaker of the ice ages. Science194, 1121–1132 (1976). [...] Sun, Y. et al. Persistent orbital influence on millennial climate variability through the Pleistocene. Nat. Geosci. https://doi.org/10.1038/s41561-021-00794-1 (2021). [...] Persistent orbital influence on millennial climate variability through the Pleistocene