Variations and schematic diagrams of Milankovitch cycles.
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Variations and schematic diagrams of Milankovitch cycles.
a, Precession and precessional index with a periodicity of ~23,000 years, with the amplitude of the cycles modulated at eccentricity periods of 100,000 years and 413,000 years (“variability packets”). b, The tilt of the Earth’s axis with a periodicity of 41,000 years. c, The eccentricity of the Earth’s orbit with periodicities of 100,000 and 413,000 years. d, Present position of the Earth in its orbit at different times of the year. e, Position of the Earth in its orbit at different times of year ~11,000 years in the future.
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Changes in Earth's orbit have helped pace climatic change for millennia. Scientists are now trying to understand whether - and how - these changes remodeled the landscapes our ancient ancestors inhabited.
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