Question

multiple-choice question
when can you see a penumbral eclipse?
when the moon passes only through the lightest part of the earths shadow.
when the moon passes only through the darkest part of the earths shadow.
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Explanation:

A penumbral eclipse occurs when the moon passes only through the lightest part of the Earth's shadow (the penumbra). The darkest part of the Earth's shadow is the umbra, and passing through only the umbra would be a total lunar eclipse (if fully in umbra) or partial (if partly in umbra). So the key is understanding the definition of penumbral (related to penumbra - the lighter shadow part).

Answer:

When the moon passes only through the lightest part of the earth's shadow.