Short video showing variations in obliquity, eccentricity, precession, put together they form the Milankovitch Cycles, related to the great trends in climate. Obliquity varies between 22.1° and 24.5° and takes 40,000 years to complete a full cycle (as axial tilt increases, winters are colder in both hemispheres.). Earth's eccentricity varies from near circular orbit to a more elliptical one, due to gravitational pull of neighboring planets, mostly Venus and Jupiter (the closer to the sun, the more solar radiation), in a 100,000 years cycle. Axial precession is the movement of the rotation axis of Earth, in a 26,000 years cycle, altering perihelion and aphelion, increasing seasonal differences from one hemisphere to the other. Finally, apsidal precession (shown at the right lower corner) is the gradual rotation of the orbit over time, with a period of 100,000 years.
see figure at [ Ссылка ]

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