Because of the revolution of the moon around the earth.
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A New Moon means "The Moon either when in conjunction with the sun or soon after. being either Invisible or Visible only as a Slender Crescent."
The phase of the full moon is when the moon appears fully illuminated, while the phase of the new moon is when the moon is completely dark or not visible from Earth.
During a new moon, the moon is located between the Earth and the Sun, with the side of the moon that is lit by the Sun facing away from Earth. This alignment results in the dark side of the moon being visible from Earth, making it appear invisible in the night sky.
The sun's corona is typically invisible because its light is overwhelmed by the much brighter photosphere. During a total solar eclipse, the moon blocks the photosphere, allowing the corona to become visible.
A moonless period is called "dark moon" or "new moon." During this time, the moon is positioned between the Earth and the sun, making it almost invisible from Earth because the side of the moon that is illuminated by the sun is facing away from us.