Moon and Its Phases

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Moon

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Earth’s natural satellite

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Satellite

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An object, such as the moon, that orbits another object, such as a planet

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Lunar cycle

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The 4 week period during which the Moon orbits Earth one time and is visible in all of its phases

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Phase

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The shape of the visible part of the Moon

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New Moon

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The phase of the Moon when the sunlit side of the Moon is not visible from Earth

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First-quarter Moon

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A phase of the Moon in the lunar cycle halfway between a new Moon and a full Moon

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Full Moon

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A phase of the Moon in the lunar cycle when the entire moon is lit and visible from Earth

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Third-quarter Moon

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A phase of the Moon in the lunar cycle halfway between the full Moon and the new Moon

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Lunar eclipse

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The effect observed when Earth passes exactly between the Moon and the Sun, casting its shadow on the full Moon

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Solar eclipse

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The visual effects created when the Moon passes exactly between Earth and the Sun.