What does the phase of the moon seen from Earth depend on?

How much of the moon’s surface is lit by the sun.

How much of the sunlit side of the moon faces Earth.

Where the observer is on Earth’s surface.

Whether or not an eclipse is occurring.

1 answer

The phase of the moon seen from Earth depends on how much of the sunlit side of the moon faces Earth. The amount of the moon's surface that is lit by the sun also plays a role. The observer's location on Earth's surface does not affect the phase of the moon, but it can affect the angle at which the moon appears in the sky. Whether or not an eclipse is occurring is not directly related to the phase of the moon, but eclipses can only occur during specific phases of the moon.
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