This astrological factor of the Moon is often ignored by magical practitioners, either because they do not understand what it means or they believe it is not significant enough to really make a difference. However, the Moon when it is Void-of-Course (usually shown in an ephemeris or moon phase guide as v/c) can have an effect, or non-effect, on magical workings and other decisions we make.
When the Moon is Void-of-Course, this indicates that it is between zodiacal signs: it has just exited one sign and is on it’s way to the next. The Moon does not always automatically move from one zodiac sign to the next. Many times it does, but there is often a between-time when the Moon does not occupy either sign. This time period can last anywhere from a matter of minutes, hours, or up to nearly two days.
When preparing to cast a spell or plan life events, and you are working with planetary/astrological energies, it is best not to do anything definate when the Moon is Void-of-Course. Doing so may mean that your spell will not manifest the way you intended, if at all. The planetary/astrological energies you are calling on are simply not there. This is because the planets have an effect on the zodiac signs, and if the Moon is between signs, the energies are scattered. There is the tendency to have unrealistic expectations associated with the decisions, and/or there could be difficulties from unknown factors. During this period actions can produce unexpected results, creative efforts can go into unexpected directions. Wait until the Moon has fully occupied the sign you wish to work with.
The void-of-course period of the Moon is the period of time from the moment the Moon makes the last contact with any planet in the current Sign of the Zodiac, and until it enters the next sign.
This excerpt from the website Lunarium explains it metaphorically:
“Each sign is like a chapter in the book of life, and moving through it the Moon is telling a story. When the Moon enters the next sign, it starts a new story. We still remember the old one, but we are not deeply involved into it anymore. Whether we notice it or not, each time the Moon enters the next Sign of the Zodiac, something substantially changes in our life, some context, or the emotional background of events. Most of the time we aren’t aware of this change because the Moon is strongly connected to our subconsciousness, not to our consciousness. It is the subconsciousness who is deeply aware of the change.
So in each of the signs the Moon starts a new story when it enters the sign, but those stories can have different lengths. Some of them continue for almost the whole two-and-a-half-day period, others are much shorter, but always there is a pause in the end of the story. It can be short or long, but it is always there. That pause in the end of the story is the void-of-course period of the Moon.
We don’t know why it happens, this pause. Maybe the story teller gives us the time to think about the content of the story we’ve just heard, or maybe it is a chance to prepare to the next story, because it is going to be very important. We just know that the pause is there…At some point the Moon makes its last contact in the given sign. That’s the end of the story, but the new story won’t start until the Moon enters the next Sign of the Zodiac”.
You can find the Void-of-Course by looking at an ephemeris, moon phase guide or astrology website. Some of you tech-savvy types may have an app on your phone. I happen to like the Llewellyn Moon Sign Book. It is very practical, easy to read, and they publish a new one every year. The Void-of-Course is marked as (v/c) or (VoC). I had some difficulty locating a picture of their chart to show you, however, below is a similar chart displaying the Void-of-Course dates for January 2015.