Tonight is a New Moon, also known as the Dark Moon.
Even in the modern Druidic calendar, the phases of the moon are followed closely. The night of the Full Moon is considered a time of rejoicing, and the night of the New Moon is a solemn occasion, calling for vigils and meditation.
To the Druids, the new moon represents total feminine energy and an absence of masculine energy. The feminine is receptor of the seed and womb of the newborn. So this is seen as a time to “plant a seed” whether that be a literal seed of plants or the seed of a child or a more proverbial or spiritual beginning.
In astronomical terminology, the new moon is the lunar phase that occurs when the Moon, in its monthly orbital motion around Earth, lies between Earth and the Sun, and is therefore in conjunction with the Sun as seen from Earth. At this time, the dark (unilluminated) portion of the Moon faces almost directly toward Earth, so that the Moon is not visible to the naked eye.
The New Moon has significance in many religions. For example, in the Hindu calendar, people generally wait for new moon to start new works. And the new moon is the beginning of the month in the Chinese calendar. Some Buddhist Chinese keep a vegetarian diet on the new moon and full moon each month.