The moon perfectly blocks out the sun during an eclipse?

Yes. On earth, we call that "New Moon Phase". During New Moon phase, the moon is "up" during the daytime, and so it IS nighttime on the other side of the earth, and the moon is NOT visible.

It happens once a month, or about every 28 days. A Solar Eclipse is a SPECIAL New Moon phase where the Sun, the Moon, and the earth all line up EXACTLY in the same line, such that the moon blocks the sunlight. A Solar Eclipse can happen ONLY during a New Moon Phase.

Conversely, when the Sun, the earth, and the Moon line up EXACTLY so that the earth block the sunlight to the moon, this is called a Lunar Eclipse , and it can happen ONLY during a Full Moon phase.

When the moon is in the sky, it is not in the sky on the opposite side of the Earth. Doesn't matter if there is an eclipse or not. Its like when the sun is in the sky over you, it is not in the sky over the other side of the planet.

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