What is the peak of the full moon?

Question: how to understand what is the peak full moon?

Answer: The moon is never in a stable condition, she is constantly increasing, then decreasing. The moment when the moon "grows" to form a full circle and is called the peak of the full moon. This moment lasts just a moment, and then the moon is beginning to wane. The naked eye can not see it and a couple of days, it seems that the moon is perfectly round, but in fact the disk of the moon is "flawed" immediately after the peak of the full moon.

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