A void of course Moon is the stretch of time between the Moon's last major aspect to a planet while it's in one sign and the moment it enters the next sign. It can last a few minutes or more than a day. Astrologers traditionally treat it as a time when new undertakings tend to drift or come to nothing, so many people use it for routine, rest and finishing things rather than for starting anything important.
How the void period is calculated
The Moon is the fastest-moving body astrologers use. It travels about thirteen degrees through the zodiac each day and changes sign every two to two and a half days. As it moves through a sign, it forms aspects, specific angles, with the Sun and planets. Most astrologers count the five major aspects for this purpose: the conjunction, sextile, square, trine and opposition.
Once the Moon has made the last of those aspects it will make in that sign, it is said to be void of course until it crosses into the next sign. On the first degree of the new sign, the void ends.
An example timeline
Say the Moon is moving through Gemini. At 24 degrees Gemini it forms an exact trine to Saturn at 24 degrees Aquarius. Checking ahead, there are no other planets it will meet by a major aspect before it leaves Gemini at 30 degrees. From the moment of that trine, the Moon is void of course. It has six degrees left to cover, which at its usual speed takes around eleven hours. When it enters Cancer, the void ends and the Moon is "on course" again.
Another week, the Moon might make its last aspect at 29 degrees and be void for only twenty minutes. Sometimes a long gap between planets leaves it void for well over a day.
Why different calendars disagree
If you compare two astrology calendars, you may find the void starts at different times. That's not an error. Astrologers disagree on the rules:
- Which planets count. Most modern calendars include Uranus, Neptune and Pluto. Traditional astrologers count only the visible planets, from the Sun out to Saturn, which can make the void start earlier.
- Which aspects count. Major aspects only is the norm. A few astrologers include minor ones, which shortens void periods.
- Where the boundary is. The common modern rule uses the sign boundary. An older version from Hellenistic astrology, sometimes translated as "running in the void," looked at whether the Moon would complete an aspect within its next thirty degrees of motion, regardless of sign.
The astrologer Chris Brennan has described three distinct definitions in the Western tradition, and calendars mostly use the modern sign-based one. Pick a source and stick with it, rather than worrying about the minutes.
Where the idea comes from
The notion that the Moon's last contacts matter goes back to Hellenistic astrology, where the Moon's movements were central to judging how things would turn out. The idea was developed by medieval astrologers and is spelled out in William Lilly's Christian Astrology of 1647, a landmark English textbook. Lilly defined a planet as void of course when it has separated from one planet and will not apply to another while it remains in its current sign. He held that matters begun under a void Moon go "hardly on," although he allowed that a void Moon in Taurus, Cancer, Sagittarius or Pisces could still perform somewhat.
In Lilly's day the void Moon was mainly a tool of horary astrology, the practice of drawing a chart for the moment a question is asked. A void Moon in a horary chart was read as "nothing will come of the matter," which is sometimes a relief to hear. The idea of checking void times for everyday life spread widely in the twentieth century, when astrological calendars began printing void periods alongside the Moon's sign changes.
What people avoid, and what's fine
The traditional advice is consistent: a void Moon is a poor time to begin things whose outcome you care about. Practitioners commonly suggest avoiding:
- signing contracts or leases
- launching a business, website or product
- making a large purchase
- first dates, job interviews or important pitches, if you can choose the time
- starting a course of action you'll find hard to undo
And the same tradition says a void Moon suits:
- routine work and admin you already understand
- cleaning, sorting and tidying
- finishing projects that are already underway
- rest, sleep, a walk, a long bath
- reflection, journaling or meditation
- reading, research and gathering information before a decision
There's a practical logic to the second list that doesn't depend on astrology. A few hours each week set aside for maintenance and rest is a good habit regardless of what the Moon is doing.
A practical approach
You don't need to plan your life around void periods, and most astrologers who use them don't. They happen several times a week. A sensible approach:
- Check the times only for things you can move. If you're choosing when to send a proposal, and a void period ends in two hours, waiting costs you nothing.
- Don't move things you can't. If a job interview is scheduled during a void Moon, go, and prepare well. Preparation matters far more than timing.
- Mind the time zone. Void periods are listed in a particular time zone. A calendar printed for New York is three hours off for Los Angeles.
- Treat it as a pause button. If you notice you're about to start something big during a void, take it as a cue to double-check the details. That's useful advice on any day.
To see which sign the Moon is in today, enter today's date into our moon sign calculator, and for what each sign is said to bring, see the Moon through the zodiac. The moon phase today page shows where the Moon is in its cycle.
The card that best pictures a void Moon is The Hanged Man: suspended, not stuck, seeing things from a different angle while nothing moves. You can read its meaning on The Hanged Man card page.
Questions readers ask
How long does a void of course Moon last?
Anywhere from a few minutes to more than a day, depending on when the Moon makes its last major aspect before changing sign. Short voids of an hour or two are common; long ones are less frequent but happen most months.
How often is the Moon void of course?
Almost every time it changes sign, which is every two days or so. So you'll usually find several void periods each week. Occasionally the Moon makes its final aspect right at the end of a sign, and the void is so short it barely registers.
Is a void of course Moon like Mercury retrograde?
They're often mentioned together because both are associated with plans going sideways, but they're different. A void Moon lasts hours and happens several times a week. Mercury retrograde lasts about three weeks and happens a few times a year. Our Mercury retrograde page explains that one.
Can I sign a contract during a void of course Moon?
Many astrologers would advise waiting if you easily can, since tradition links void Moons with agreements that fall through or need renegotiating. If the deadline is fixed, sign it, and read it carefully first. A clear contract does more for you than a well-timed one.
