The first diagram shows that moon is least visible from the earth due to darkness.
The first diagram shows that moon is least visible from the earth because the moon is present behind the earth or earth is present in between sun and moon. The moon is not visible due to its presence in the dark. If it is present at the side of the earth then the moon is more clearly visible due to the light of the sun so we can conclude that the first diagram shows the moon is least visible from the planet earth.
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