AST-108intermediate

Axial Tilt, Seasons & Precession: Physical Mechanisms

Earth's seasons are caused primarily by the 23.5-degree tilt of its rotation axis, not by large changes in Earth-Sun distance. Axial tilt controls the seasonal cycle of insolation, while precession changes the long-term relation between the seasons and Earth's orbital position.

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Axial Tilt, Seasons & Precession: Physical Mechanisms

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AST-107Axial Tilt, Seasons & Precession: Structures & Vocabulary→

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AST-109Axial Tilt, Seasons & Precession: Observation, Measurement & Evidence→

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Earth's seasons are caused primarily by the 23.5-degree tilt of its rotation axis, not by large changes in Earth-Sun distance.

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A hemisphere tilted toward the Sun receives sunlight at a steeper angle and for more hours each day, concentrating more solar energy per unit area.

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