A New Moon occurs when the Moon is directly between the Earth and the Sun and not visible from Earth.
In its monthly orbital motion around Earth, the Moon comes into conjunction with the Sun as seen from Earth. The dark side of the Moon faces almost directly toward Earth, so that the Moon is not visible to the naked eye and reflects no light into the night sky.
This is the best time of the month to observe faint objects such as meteor showers, galaxies and star clusters because there is no moonlight to interfere.
Only during a New Moon can a total solar eclipse occur, and only when the Moon's orbit is within 0.5 degrees of the plane of the ecliptic, a line that passes through the center of the Sun and the Earth. Consequently, there is not always a solar eclipse during a New Moon.
The Earth and Moon from Space