I think it MIGHT be something to do with the sun not the earths shadow
The new moon is caused by the moon's revolution around Earth and the side of the Moon light from the Sun is hitting at that time. A new moon occurs when the moon is in the point of its orbit around Earth when it is near where we see the Sun. Since its shadowed side faces us, we don't see it during the daytime.
The new moon phase appears completely dark when observed from Earth because the side of the moon illuminated by the sun is facing away from us. This means that no sunlight is reaching the side of the moon that we can see, making it invisible to us.
The position of the sun and moon cause shadowing effects. These shadowing effects are the phases of the moon. A moon can be partially shadowed as in the crescent to a new moon, which is dark.
During a new moon, the earth blocks the sun's rays from hitting the moon, and thus does not let the moon reflect light to your eye. Basically, the new moon is covered completely by the earth's shadow.
The "new moon" by definition is the moon phase where it is completely in the earth's shadow, and we cannot see it at all. New moon is the exact opposite of "full moon".
It's a matter of shadows. In a solar eclipse, the shadow of the Moon falls on the Earth, which can only happen when the Moon is between the Earth and the Sun; at the NEW moon. A lunar eclipse occurs when the shadow of the Earth falls on the Moon, when the Earth is between the Sun and the Moon - a full moon. Since the Earth is much bigger than the Moon, the Earth's shadow is also larger; this is why the Moon normally becomes completely shadowed during a lunar eclipse. The Moon's shadow on the Earth is much smaller, so only a small area of the Earth is in the shadow.
When the shadow of the earth covers it completely. It's called a lunar eclipse or new moon.
A new moon appears completely dark on Earth because the side of the moon illuminated by the sun is facing away from us, so the reflected light is not visible from our perspective. This alignment creates a new moon phase, where the moon is not visible in the night sky.
The shadow of the Earth on the moon's surface is the reason that it takes different phases. When the Earth completely occludes the moon, it is a new moon, and when there is no shadow, it is a full moon.
During the new moon phase, the moon is completely hidden from view as it is situated between the Earth and the Sun. This is when the side of the moon that is illuminated by the Sun is facing away from Earth, making it appear invisible in the sky.
A solar eclipse occurs when the moon is interposed between the Earth and the sun. This means that the dark side of the moom is facing Earth. The phase of the moon where the dark side faces Earth is called the New Moon.
The moon is below the horizon during the nighttime hours when the moon is new but even when it is above the horizon it can't be seen because the shadowed side of the moon is facing us on Earth and the moon is so close to the sun that it is lost in the sun's glare.