Void-of-Course Moon Explained

With the Moon at 24 degrees of Libra at 9:00 a.m., its last aspect is a sextile to Venus at about 6:05 p.m., so it is void until it enters Scorpio near 7:55 p.m.

A void-of-course Moon, often shortened to VOC, is the stretch between the last major aspect the Moon makes before leaving a sign and the moment it enters the next sign. The old wording describes a Moon that is not heading toward any more contacts.

The Moon crosses a sign in about 2.3 days on average (30 degrees at about 13 degrees a day), and the time ranges from about 2 to 2.5 days. As it travels it forms aspects (0, 60, 90, 120 and 180 degrees) to other planets. In the classic rule only the traditional planets count, Sun through Saturn. Once the last of those aspects has been completed, the Moon is void until it enters the next sign.

Moon calendars list these intervals, but you can check one by hand with a table of planetary positions.

1. Find the Moon’s sign and degree and the exact time of its next sign change.
2. List the other six traditional planets (Sun, Mercury, Venus, Mars, Jupiter, Saturn) and their positions.
3. For each one, check whether the Moon will still form a conjunction, sextile, square, trine or opposition to it before reaching the end of the sign.
4. Convert the remaining degrees to hours. The Moon moves about 0.55 degrees an hour (13.2 degrees divided by 24).
5. The latest of those aspects is the last. The Moon is void from that moment to the sign change.

This is a made-up sky chosen for the arithmetic, and not a possible real one, since Mercury and Venus never stray this far from the Sun. At 9:00 a.m. the Moon is at 24 degrees of Libra. Jupiter is at 27 Aquarius, Mercury at 28 Aries and Venus at 29 Leo. The Sun is at 10 Scorpio, Mars at 3 Capricorn and Saturn at 15 Pisces, and none of the three has a major aspect still ahead of the Moon in Libra.

The Venus sextile is the last aspect, so the Moon is void from about 6:05 p.m. to about 7:55 p.m., roughly 1 hour and 50 minutes. The Moon’s speed varies from day to day, so a calendar’s times will differ from this rough sum by some minutes.

In general the interval can last from a few minutes to more than a day. It is short when the last aspect falls just before the sign change. It is long when the Moon makes its last aspect soon after entering a sign and then passes many degrees with nothing left to contact.

In traditional timing work, a Moon with no more contacts to make is described as having nothing to carry forward. The classic suggestions are about how to use the interval, not about what it causes.

• Hold off on starting something important or launching something new.
• Prefer routine, familiar tasks and finishing what is already under way.
• Use the time to rest, review or tidy.
• Do not read a delay as a sign of failure; the tradition treats it as a pause.

The rule comes from horary and electional astrology, the older branches that answer a question or choose a moment to begin something. In those traditions the Moon is the fastest body and acts as a messenger, carrying the influence of one planet to the next. A Moon with no further contact to make is said to have nothing to deliver.

That is a symbolic rationale. It is easy to apply mechanically and hard to test, which is part of why astrologers divide over it. If you try it, note that different calendars may use different rules, so check which one yours follows.

There is no single agreed rule, and many astrologers ignore the idea altogether. The table shows the main splits.

Treat it as optional timing. No consequence of a void-of-course Moon has been established, and a change of rule changes the interval, so it is never a universal unlucky period.

1. Decide whether you want a timing tool at all. Many people do not.
2. If you do, pick one rule, such as the seven traditional planets, and keep to it.
3. Try it for a few months with no stakes, and note what you did during each interval.
4. If it adds nothing, drop it.
5. Never use it to delay anything urgent or required.

This is a made-up sky. At 6:00 a.m. on Day 1 the Moon enters Gemini at 0 degrees. The only major aspect it still makes in Gemini is a trine to Saturn at 14 degrees of Aquarius, exact when the Moon reaches 14 degrees of Gemini. The other five traditional planets are placed so that none aspects the Moon anywhere in Gemini.

Fourteen degrees at 0.55 degrees an hour is about 25.5 hours, so the trine is exact at about 7:30 a.m. on Day 2. The 16 degrees left take about 29 hours, so the Moon leaves Gemini at about 12:30 p.m. on Day 3. The void interval lasts about 29 hours. Real skies seldom leave a gap this wide, and a calendar’s times will differ by some hours because the Moon’s speed varies.

Why does my calendar show a different time from a friend’s? Void times are printed in one time zone, often a city’s local time or Universal Time, and daylight saving shifts local clocks by an hour. Convert to your own time zone before you compare, and check which rule each calendar follows.

Is the Moon void at a new or full Moon? Not at that instant. The Moon is then in an exact aspect with the Sun, so a void interval can begin only afterward, and only if no other traditional planet is left to contact before the sign change.

Astrologers disagree on which planets and aspects count, and no consequence of a void Moon has been established, so it is never a universal unlucky period.