The entire western half (left side) of the Moon is lit during the which quarter phase?

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Explore the intricacies of the Sun-Earth-Moon System with our C20 Test. Utilize flashcards and multiple choice questions to gain a comprehensive understanding of celestial mechanics. Prepare thoroughly for your exam!

Multiple Choice

The entire western half (left side) of the Moon is lit during the which quarter phase?

Explanation:
When you watch the Moon, the illuminated portion tells you how the Sun, Moon, and Earth line up. The phase in which exactly half of the Moon’s near side is lit and that lit half appears on the left is the last quarter (Third Quarter) phase. This is the moment when the Moon is waning after a Full Moon and the left half faces sunlight for observers in the Northern Hemisphere. If you’re in the Southern Hemisphere, the left-right orientation would be flipped, and you’d see the right half lit at that same phase. The other phases don’t match this left-half illumination: First Quarter shows the right half lit, Full Moon shows the entire disk lit, and New Moon shows no illumination.

When you watch the Moon, the illuminated portion tells you how the Sun, Moon, and Earth line up. The phase in which exactly half of the Moon’s near side is lit and that lit half appears on the left is the last quarter (Third Quarter) phase. This is the moment when the Moon is waning after a Full Moon and the left half faces sunlight for observers in the Northern Hemisphere. If you’re in the Southern Hemisphere, the left-right orientation would be flipped, and you’d see the right half lit at that same phase. The other phases don’t match this left-half illumination: First Quarter shows the right half lit, Full Moon shows the entire disk lit, and New Moon shows no illumination.

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