What a void-of-course Moon is
The Moon is the fastest body in the sky. She crosses a sign of the zodiac in about two and a quarter days on average, and on her way through it she meets the other planets by aspect: she joins them by conjunction, or reaches them at a sextile (60°), square (90°), trine (120°) or opposition (180°). Each of those happens at an exact moment, when the angle between her and the planet is exactly right. After the last such moment in a sign, the Moon is said to be void of course until she enters the next sign. She is still moving, as fast as ever, but in the language of the tradition she has no more business to complete in the sign she is in.
The void can be a matter of minutes, when her last aspect falls just before the end of the sign, or it can run for many hours when the last aspect comes early. The card at the top of this page compares this minute with the void periods worked out for 2026 and 2027 and says which side of the line we are on: void since her last aspect, and until when, or still in course, with her next aspect named. Times are shown in your own time zone. For whole years, open the void of course Moon 2026 and 2027 calendars.
How this page counts it
Calendars of the void Moon disagree with each other, sometimes by hours, and the reason is the definition. This page uses a strict one, the same one the AstroGPT app applies when it reads the Moon in a Western-mode chart:
- The classical planets only. The aspects that count are those to the Sun, Mercury, Venus, Mars, Jupiter and Saturn. Uranus, Neptune and Pluto, unknown to traditional astrology, are left out, and so are the lunar nodes.
- Exact Ptolemaic aspects. Conjunction, sextile, square, trine and opposition, counted at the moment they are exact, with no orbs.
- The other planet must still be in its sign. An aspect counts only if the planet the Moon is reaching is still in the sign it occupies now when the aspect perfects. If that planet changes sign first, the aspect is not completed, and the Moon may be void earlier than a simple count would suggest.
The last rule has a consequence that surprises people who compare calendars: a void period can end when another planet changes sign, not only when the Moon does. Once that planet has entered its new sign, an aspect the Moon makes to it before she leaves her own sign counts again, so she is back in course until she makes it. One passage of the Moon through a sign can therefore hold two void periods, and the list on this page says so where it happens.
Most popular calendars count aspects to the modern planets as well. With three more planets to meet, the Moon makes her last aspect later in the sign, so their void periods are often shorter and begin later than ours. Neither list is wrong; they answer different questions. This page keeps to the planets of traditional horary because that is the astrology the void Moon comes from, and so that this page and the app, in Western mode, give the same answer for the same moment.
What it traditionally means
In traditional astrology the Moon is the swift carrier of light between the planets and a general significator of how things flow. When she has no aspect left to make, she carries nothing further, and the tradition reads that as a matter that runs out of motion. William Lilly, writing in 1647, defines a planet as void of course when it has separated from one planet and does not apply to another while it stays in its sign. Among his considerations before judgement he warns that “all manner of matters go hardly on” when the Moon is void, unless the principal significators are very strong, and he makes an exception: in Taurus, Cancer, Sagittarius and Pisces the void Moon still performs somewhat.
In Lilly’s English, hardly means with difficulty, not barely at all. The picture is of effort that leads nowhere much: a plan that drifts, news that changes nothing, a meeting that ends where it began. Electional astrology, which picks a moment to begin something, therefore prefers a Moon that goes on to a good aspect, and many astrologers let a void pass before they launch something important. The same tradition is relaxed about what a void Moon suits: rest, routine and finishing what is already started.
Lilly’s own wording is looser than this page’s rule, and some horary astrologers who follow him still treat a Moon within orb of an aspect as in course. Either way, a void Moon is one testimony among many, never a verdict on its own and nothing to be afraid of.
The void Moon in a horary question
A horary chart is drawn up for the minute a question is put, and its answer is read from the planets that stand for the people and the matter, the significators. The ruler of the Ascendant and the Moon stand for the querent, the person asking, and the ruler of the house of the matter stands for the quesited, the thing asked about. The answer is yes when the significators come together by an applying aspect, a perfection, and no other planet gets in the way. The horary astrology guide explains the houses, the significators and these tests in full.
The Moon’s course matters because her next aspect shows what happens next. If she applies to the planet of the matter, she can bring it about on her own; if her next aspect is to another planet, that meeting is the next development. If she is void, there is no next development to show, and when the significators make no perfection either, the chart leans to no, or to nothing coming of it. When they do perfect, the perfection carries the answer, and the void Moon at most qualifies it.
How AstroGPT reads the Moon’s course
AstroGPT is a horary astrologer in an app. You type a question; it casts a chart for the minute the chat starts at your phone’s location and reads the answer from it. In Western mode, which uses Equal houses and 1° aspect orbs, the reading is given the Moon’s course for that minute, worked out the way this page works it out: the last exact aspect she made, the next one she will make in her sign, or, if she is void, the moment she enters the next sign.
How it weighs that is plain. When the querent’s significator and the ruler of the house of the question perfect, that perfection answers the question and outweighs a void Moon. When there is no perfection, a void Moon leans the answer to no. The reply opens with the verdict and then explains it, and the chart stays open for further questions for an hour. Vedic mode reads the chart as a Prashna, by its own rules.
The app sends no reminders when the Moon goes void, and it does not read your birth chart; the times on this page are here for you to look up. To see where the Moon stands now, open today’s planetary positions, or find your own Moon sign with the Moon sign calculator. If you would rather know the hour than the Moon, planetary hours gives the ruler of each hour of today for your city. Everything here is offered for reflection and entertainment.
Ask your question and see where the Moon is heading
AstroGPT casts a horary chart for the minute you ask, where you are, and in Western mode weighs the Moon’s course with the rest of the chart. Start with free trial questions.