Question

In the image (not to scale), which phase of the moon would you observe from the earth?


A crescent
B full
C half
D new
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Answer 1

I can’t see the image — could you upload it or describe the positions of the Sun, Earth and Moon in the diagram (for example: “Moon is between the Sun and Earth”, “Moon is on the far side of Earth from the Sun”, or “Moon is 90° to the side of Earth relative to the Sun”)?

If you want to decide it yourself, use this rule: the Moon’s lit side always faces the Sun, and the phase seen from Earth depends on how much of that lit side is visible from Earth.

- Moon between Sun and Earth → New moon (D).
- Moon on the far side of Earth from the Sun → Full moon (B).
- Moon at a right angle (90°) to the Sun-Earth line → Half moon / quarter (C).
- Moon close to between but slightly off → Crescent (A).

Tell me the configuration and I’ll pick the correct choice.