
16. New Moon
The Moon’s first phase is referred to as a new Moon. This occurs when the Sun and the Moon have the same ecliptic longitude. When the Moon is in this phase, it is not visible to the naked eye. That is because at this time the Moon is too close to the Sun.
Even though we cannot see the Moon during the new Moon phase, it presents itself as a very thin crescent. The average length of time from a new Moon to the next New Moon is just over 29 days. This is referred to as a lunation. Every month in the lunar calendar relates to a lunation.