What is the phase of the Moon, as observed from Earth, when the Moon is rising near sunset?

Question

BlackTom AI · Accepted Answer

When the Moon rises near sunset it is roughly opposite the Sun in Earth's sky, which corresponds to the Full Moon phase.

Relevant concepts:
- The lunar phase depends on the Sun–Moon–Earth geometry, specifically the elongation (angle between Sun and Moon as seen from Earth).
- A Full Moon occurs when the Moon is nearly 180° from the Sun (opposite the Sun), so its near side is fully illuminated as seen from Earth.
- Rise/set times for principal phases: New Moon rises and sets with the Sun; First quarter rises around noon and sets around midnight; Full Moon rises at sunset and sets at sunrise; Third quarter rises at midnight and sets at noon.

Step-by-step reasoning:
1. Identify the observational timing: the Moon is rising near sunset.
2. Relate timing to relative position: an object rising at sunset is located roughly opposite the Sun on the celestial sphere (it will culminate near local midnight).
3. Translate the position to phase: when the Moon is opposite the Sun (elongation ≈ 180°) we see the Sun fully illuminating the Moon’s face toward Earth → Full Moon.
4. Check consistency: a Full Moon is visible all night, highest at midnight, rising at sunset and setting at sunrise, matching the observation.

Why the correct answer is correct:
- At Full Moon the Moon’s illuminated hemisphere faces Earth because the Sun, Earth, and Moon are in nearly a straight line with Earth between Sun and Moon; that geometry makes the Moon rise at sunset.

Why other options are incorrect:
- New Moon: near the Sun in the sky, rises and sets with the Sun (not at sunset).
- First quarter: about 90° east of the Sun, rises near noon and sets near midnight (not at sunset).
- Third quarter: about 90° west of the Sun, rises near midnight and sets near noon (not at sunset).

Conclusion: The correct phase is Full Moon, which matches the provided answer.

What is the phase of the Moon, as observed from Earth, when the Moon is rising near sunset?单项选择题

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