The Milankovitch cycles are a set of cyclic variations in characteristics of the Earth's orbit around the sun. (newworldencyclopedia.org)
This likely due to non cyclic variation in the time series that is not accounted for in the pure cosine model. (judithcurry.com)
Samples drilled from evenly spaced sites along the tooth also revealed cyclic variations in isotope ratios, including strontium, carbon, and oxygen, suggesting that this animal migrated about 200 kilometers each year, Price and his colleagues report today in the Proceedings of the Royal Society B. (sciencemag.org)