According to the Milankovitch theory, the total heat received from the sun varies very little, but there is enough interaction of orbit and tilt changes to cause climate changes.

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The Milankovitch theory proposes that variations in Earth's orbit and axial tilt cause changes in the distribution and intensity of sunlight, which in turn can lead to climate changes. However, the total amount of heat received from the sun remains relatively constant.

According to the Milankovitch Theory, the Total Heat Received from the Sun