What is the uneven distribution of insolation by latitude primarily a result of?

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Quizplus · Accepted Answer

The uneven distribution of insolation by latitude is primarily a result of the curvature of Earth, which presents varied angles to parallel solar rays. The angle at which the solar rays hit the Earth's surface changes as we move from the equator to the poles, resulting in variations in insolation. This is known as the latitudinal effect. Variability in the output from the Sun and changing distances of Earth from the Sun also affect insolation, but these factors are not primarily responsible for the latitudinal variation. Variation in the value of a watt is not relevant to insolation.

What Is the Uneven Distribution of Insolation by Latitude Primarily