Why is it that the rounder the moon, the fewer stars there are

Because the rounder the moon is, the bigger and brighter it is, and the more it can light up the sky. When the sky is bright, the starlight is diluted, and some dark stars can't be seen, so there are fewer stars
For example, in the daytime, the sun is much brighter than the moon. If the sky is bright, the stars will disappear

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