Abstract
As the Earth goes around the Sun, its equatorial plane is inclined at an angle of 23°27′ to the plane of its orbit (the obliquity of the Ecliptic), and this is the cause for the cycle of the seasons on the Earth's surface. If the obliquity is increased, then Winter in high latitudes will be colder, and Summer will be hotter; in the contrary case, the annual variation in the temperature will be less. The general opinion is that the amplitude of oscillation of the obliquity is very small, that the obliquity oscillates only between 22°O′ and 24°30′ with a period of 40400 years. Over the geological time, there have appeared a number of great ice ages, and from the geography of palaeontology there are indication of periods of general warming-up. Evidently, the climatic variation in geological time is much greater than what is recorded in Man's written history, and a greater variation in the obliquity could well be one of its main causes. In this paper, we make some preliminary investigation of the oscillation amplitude of the obliquity in the geological time, using as our primary datum the geographical distribution of amphibians and reptiles in the Triassic Period.
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