The Moon is said to be void of course from the moment it makes its last major aspect to a planet until it enters the next sign. This calculator shows that window for any date: the Moon's current sign, when the void period begins, and when the Moon changes sign and the void ends.
What Void of Course Means
As the Moon travels through a sign it forms aspects to the other planets. After its final aspect in that sign, it drifts on with nothing more to connect with until it crosses into the next sign. During this gap it is void of course, a kind of pause in the lunar cycle.
How It Is Traditionally Used
Older astrologers treated a void Moon as a poor time to begin anything you want to come to a definite result, since plans started then were said to fizzle out or take an unexpected turn. Routine tasks, rest, reflection and finishing existing work are usually considered fine. It is a guideline for timing, not a warning of bad luck.
How This Calculator Finds It
For the date you choose, the calculator tracks the Moon through its current sign, notes the last exact aspect it makes to a classical planet, and finds the moment it enters the next sign. The period between those two points is the void of course window, shown in universal time.
What You Need
Just a date, and optionally your timezone so the times line up with your day. No birth details are required, since the Moon's motion is the same for everyone.
Common Questions
What is a void of course Moon?
It is the period when the Moon has made its last major aspect in a sign and has not yet entered the next sign, so it forms no more aspects in between.
Why avoid starting things on a void Moon?
Tradition holds that ventures begun under a void Moon tend not to develop as planned. Routine work, rest and wrapping up existing tasks are considered unaffected.
Do I need my birth chart for this?
No. The void of course Moon is the same for everyone on a given date; you only need the date and, ideally, your timezone.
Positions are computed with the Swiss Ephemeris. Astrological interpretations are traditional and are offered for reflection and entertainment, not as guaranteed predictions.
Explore more
Related astrology tools worth a look: Eclipse Calculator, Draconic Chart Calculator, Secondary Progressions Calculator and Fixed Stars Calculator. They each come at the topic from a different direction, so a quick compare is genuinely handy. Everything is gathered on the astrology calculators page, plus the complete calculator list.