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Moon PhasesMoon Phases
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• From any location on the Earth, the Moon appears to be a circular disk which, at any specific time, is illuminated to some degree by direct sunlight.
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• Like the Earth, the Moon is a sphere which is always half illuminated by the Sun, but as the Moon orbits the Earth we get to see more or less of the illuminated half.
Galileo spacecraft, 1992
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Earth & Moon: Earth & Moon: Both Show Phases!Both Show Phases!
Galileo spacecraft, 1992
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How many total Phases do we see How many total Phases do we see from the moon?from the moon?
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Moon orbits EarthMoon orbits Earth
• During each lunar orbit (a lunar month), this cycle is a continuous process, there are eight distinct, traditionally recognized stages, called phases.
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The Moon The Moon appearsappears to have Phases to have Phases
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What is each Phase called?What is each Phase called?
• New Moon - The Moon's unilluminated side is facing the Earth. The Moon is not visible (except during a solar eclipse).
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What is each Phase called?What is each Phase called?
• Waxing Crescent - The Moon appears to be partly but less than one-half illuminated by direct sunlight. The fraction of the Moon's disk that is illuminated is increasing.
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What is each Phase called?What is each Phase called?
• First Quarter - One-half of the Moon appears to be illuminated by direct sunlight. The fraction of the Moon's disk that is illuminated is increasing.
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What is each Phase called?What is each Phase called?
• Waxing Gibbous - The Moon appears to be more than one-half but not fully illuminated by direct sunlight. The fraction of the Moon's disk that is illuminated is increasing.
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What is each Phase called?What is each Phase called?
• Full Moon - The Moon's illuminated side is facing the Earth. The Moon appears to be completely illuminated by direct sunlight.
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What is each Phase called?What is each Phase called?
• Waning Gibbous - The Moon appears to be more than one-half but not fully illuminated by direct sunlight. The fraction of the Moon's disk that is illuminated is decreasing.
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What is each Phase called?What is each Phase called?
• Last Quarter - One-half of the Moon appears to be illuminated by direct sunlight. The fraction of the Moon's disk that is illuminated is decreasing.
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What is each Phase called?What is each Phase called?
• Waning Crescent - The Moon appears to be partly but less than one-half illuminated by direct sunlight. The fraction of the Moon's disk that is illuminated is decreasing.
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And Finally…And Finally…
• Following waning crescent is
New Moon, beginning a repetition of the complete phase cycle of 29.5 days average duration.
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Use this slide (as a guide) to Use this slide (as a guide) to complete pg. 1 of complete pg. 1 of Lunar PhasesLunar Phases