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

Question

BlackTom AI · Accepted Answer

A Full Moon rises at approximately sunset because the Moon is then on the opposite side of Earth from the Sun.

1. Relevant knowledge points and concepts
- Lunar phase depends on the Sun–Moon–Earth geometry (the Moon’s elongation from the Sun).
- A Full Moon occurs when the Moon is roughly 180° opposite the Sun, so its sunlit face is fully visible from Earth.
- The rising and setting times of the Moon relate to its phase: New Moon rises and sets with the Sun; First Quarter rises near noon and sets near midnight; Full Moon rises at sunset and sets at sunrise; Third Quarter rises near midnight and sets near noon.

2. Step-by-step reasoning
- At sunset the Sun is on the western horizon. For the Moon to be rising at that same time, it must be near the eastern horizon.
- That configuration places the Moon approximately opposite the Sun in the sky (180° apart), which is precisely the configuration that produces a Full Moon: the side of the Moon facing Earth is fully illuminated by sunlight.
- Therefore, the phase observed when the Moon is rising near sunset is the Full Moon.

3. Calculations / intermediate steps
- No numerical calculation is required; reasoning uses angular positions: Sun at 0° on horizon, Moon at ~180° opposite → Full Moon.

4. Why the correct answer is correct
- Full Moon corresponds to the Moon being opposite the Sun in the sky, so it is on the eastern horizon as the Sun sets in the west. That makes it rise near sunset and remain visible all night.

5. Why the other options are incorrect
- Third quarter Moon: rises near midnight and is highest at sunrise, not at sunset.
- New Moon: is near the Sun, so it rises and sets with the Sun (rises at sunrise), not at sunset.
- First quarter Moon: rises around noon and is highest near sunset, but it is not rising at sunset (it has already been above the horizon since midday).

6. Conclusion
This confirms the correct answer is Full Moon, matching 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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