Which of the following describes when the Third Quarter Moon would be visible?

Question

BlackTom AI · Accepted Answer

To determine when the Third Quarter Moon is visible, we need to recall the Moon phase cycle and its daily motion.
Option 1: 'Rises at sunset, sets at midnight' describes the First Quarter Moon, which rises around noon and sets around midnight? Actually, First Quarter typically rises around noon and sets around midnight, so this option mismatches the standard timing for a first-quarter phase, not third quarter.
Option 2: 'Rises at midnight, sets at sunrise' would indicate a Moon that is up throughout the night and disappears at dawn. While this is close to the general visibility of a late-night object, it does not match the Third Quarter, which is not rising exactly at midnight for all skies and has a broader daytime visibility window; also, it would not be described as consistently visible through the early morning as a third quarter generally is.
Option 3: 'Rises at midnight, sets at noon' correctly aligns with the Third Quarter Moon, which rises around midnight and is highest near dawn, setting around noon. This is the standard pattern for the last quarter phase, where the left half is illuminated in the Northern Hemisphere and the Moon transitions from night into the morning sky.
Option 4: 'Rises at sunset, sets at sunrise' corresponds more closely to the Full Moon or a Moon rising in the evening and setting in the morning, which is characteristic of a Full Moon or a near-full phase, not the Third Quarter.
In summary, evaluating the typical rise and set times for each lunar phase shows that the Third Quarter Moon is the one that rises at roughly midnight and sets around noon, making Option 3 the correct description. The other options either describe different phases or misstate the Moon’s daily motion and visibility window, leading to incorrect associations with the Third Quarter.

ASTR-1-45046-F25 Lecture: The Cosmic Distance Ladder Part 1

Which of the following describes when the Third Quarter Moon would be visible?

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