Question

which positions of the earth, sun, and moon will show you a full moon at night?

Explanation:

To determine the position for a full moon, we recall the full moon occurs when the Earth is between the Sun (S) and the Moon (M). This is because the Sun illuminates the entire face of the Moon visible from Earth. Let's analyze each option:

• First diagram: Moon is on the same side as Sun relative to Earth – not full moon.
• Second diagram: Moon is between Sun and Earth – this is a new moon (not full).
• Third diagram: Moon is above Earth, but Sun is to the left. Not aligned as Earth - Sun - Moon (or Sun - Earth - Moon? Wait, no: For full moon, the order is Sun → Earth → Moon (in a straight line), so Earth is between Sun and Moon. Wait, maybe the third diagram: Wait, let's re - check. Wait, the third option (the one with M above E, S to the left of E) – no, wait, the correct alignment for full moon is Sun, Earth, Moon in a straight line, with Earth in the middle. So the Moon is on the opposite side of Earth from the Sun. Looking at the diagrams, the last diagram (where M is on the opposite side of E from S) – wait, maybe the third option? Wait, no, let's think again.

Wait, the full moon happens when the Moon is on the opposite side of the Earth from the Sun, so the Sun, Earth, and Moon are in a straight line with Earth in the middle. So the correct position is when the Sun (S) is on one side of Earth (E), and the Moon (M) is on the exact opposite side of Earth from the Sun. So among the diagrams, the one where S is on the left, E in the middle, and M on the right (opposite side of S relative to E) – looking at the options, the last diagram (the fourth one? Wait, the user's diagram: Let's parse the diagrams:

1. First: S in center, M on left, E on right.
2. Second: S on left, E in center of a circle, M on left of E (between S and E).
3. Third: S on left, E in center, M above E.
4. Fourth: S on left, E in center, M on right (opposite S relative to E).

Ah, the fourth diagram (where M is on the opposite side of E from S) is the correct one. Because in a full moon, the Sun, Earth, and Moon are aligned with Earth between the Sun and the Moon. So the Sun's light fully illuminates the side of the Moon facing Earth. So the position is Sun - Earth - Moon (in a straight line, Earth in the middle). So the correct diagram is the one where M is on the opposite side of E from S (the last diagram in the user's image).

Answer:

The position where the Sun (S), Earth (E), and Moon (M) are aligned in a straight line with Earth between the Sun and the Moon (e.g., the diagram where M is on the opposite side of E from S).