Mathematics – Logic
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980m%26p....23..253k&link_type=abstract
The Moon and the Planets, Volume 23, Issue 2, pp.253-258
Mathematics
Logic
Scientific paper
It is pointed out that while the long-periodic variations of the elements of the terrestrial orbit around the Sun are probably sufficient to account for the frequency-spectrum of recurrent ice-ages established from the geological record of climatic changes experiences by the Earth in the course of the past half a million years, such kinematic phenomena cannot account naturally for the sudden onset of the Ice Age at the end of the Tertiary Epoch; nor for the fact that previous Ice Ages (in the Permian or pre-Cambrian times) are separated by milder (ice-free) intervals lasting 100 times longer than the periods of intermittent glaciation). Other astronomical phenomena (such as the galactic orbit of the solar system, which may cause our Earth temporarily to pass through different types of galactic climate; or temporary fluctuations in the energy output of the Sun), as well as geophysical phenomena (changes in atmospheric chemistry, and consequent fluctuations of the ‘greenhouse effect’), may have to be invoked to account for the geological facts by their combined effects.
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