Why Is One Phase of the Moon Called "Third Quarter

question 48

Multiple Choice

Why is one phase of the Moon called "third quarter"?

• A) because three-quarters of the visible surface is illuminated
• B) because three-quarters of the entire surface is illuminated
• C) because the third quarter (i.e., half of the back side not visible from Earth) is illuminated
• D) because the Moon is three-quarters of the way through its cycle, New Moon to New Moon

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