Explain Milankovitch oscillations with suitable diagrams. Explain the factors affecting amount of energy flux received at the earth's surface.

Milankovitch oscillations are long-term variations in Earth's orbit and axial tilt, which influence the planet's climate patterns over thousands to millions of years. These variations are named after the Serbian mathematician and astronomer Milutin Milankovitch, who developed a theory in the early 20th century to explain how these orbital variations contribute to climatic changes, particularly the advance and retreat of ice ages.

The key components of Milankovitch oscillations include three primary orbital parameters: eccentricity, axial tilt (obliquity), and precession. These three factors interact in complex ways to alter the amount and distribution of solar energy that Earth receives, affecting long-term climatic patterns.

1. Eccentricity

Eccentricity refers to the shape of Earth's orbit around the Sun. The Earth's orbit is not a perfect circle, but an ellipse, which means that the distance between the Earth and the Sun changes throughout the year. Eccentricity describes the degree to which the orbit deviates from a perfect circle, ranging from zero (a perfect circle) to one (a highly elongated ellipse).

Over a period of about 100,000 years, the Earth's orbit fluctuates between more circular and more elliptical shapes. When the orbit is more elliptical, the Earth is farther from the Sun during parts of the year, receiving less solar radiation. Conversely, when the orbit is more circular, the distance between the Earth and the Sun is more uniform, leading to a more consistent solar flux throughout the year.

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