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Milankovitch oscillations are long-term variations in Earth’s orbit and axial orientation that influence the distribution and intensity of solar radiation received on Earth’s surface, thereby playing a crucial role in driving climatic changes over geological timescales. These oscillations were first proposed by Serbian mathematician and astronomer Milutin Milankovitch in the early 20th century as a framework to explain the occurrence of ice ages and interglacial periods. The three primary components of these oscillations include eccentricity, obliquity, and precession, each operating on different timescales and affecting the seasonal and latitudinal distribution of insolation. Eccentricity refers to the shape of Earth’s orbit around the Sun, which varies from more circular to more elliptical over cycles of approximately 100,000 and 400,000 years. When the orbit is more elliptical, the difference between perihelion (when Earth is closest to the Sun) and aphelion (when Earth is farthest from the Sun) becomes more pronounced, leading to variations in the amount of solar radiation Earth receives during different seasons. Although eccentricity has a relatively small direct effect on the total annual insolation received, it modulates the impact of precession by determining the contrast between solar radiation received at different times of the year. Obliquity, or axial tilt, is the angle between Earth’s rotational axis and the perpendicular to the plane of its orbit, currently about 23.5 degrees but varying between 22.1 and 24.5 degrees over a cycle of _____ ________ __________ _____ _______ _______ _______ _______.
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