AST-118intermediate

Lunar Phases, Libration & Synchronous Rotation: Physical Mechanisms

Lunar phases result from changing viewing geometry between the Sun, Earth, and Moon. Understanding phase geometry is essential for planning observations, interpreting lunar photographs, predicting moonrise times, and distinguishing ordinary phases from eclipses.

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Lunar Phases, Libration & Synchronous Rotation: Physical Mechanisms

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AST-117Lunar Phases, Libration & Synchronous Rotation: Structures & Vocabulary→

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AST-119Lunar Phases, Libration & Synchronous Rotation: Observation, Measurement & Evidence→

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Lunar phases result from changing viewing geometry between the Sun, Earth, and Moon.

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As the Moon moves eastward around Earth, the Sun-Moon-Earth angle changes and so does the portion of the sunlit hemisphere visible from Earth.

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