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3-1 The phases of the Moon are caused by its orbital motion
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3-2 The Moon always keeps the same face toward Earth
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3-3 Eclipses occur only when the Sun and Moon are both on the line of nodes
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3-4 The character of a lunar eclipse depends on the alignment of the Sun, Earth, and Moon
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3-5 Solar eclipses also depend on the alignment of the Sun, Earth, and Moon
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3-6 Ancient astronomers measured the size of Earth and attempted to determine distances to the Sun and Moon
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