When the Moon is void of course.

What void of course means

As the Moon crosses a sign it makes a run of exact aspects to the Sun and the planets. After the last of them there is nothing left to perfect before the sign ends, and the Moon is said to be void of course until it enters the next sign. The tradition reads that stretch as a pause: what is begun then is said to drift, while finishing, resting, and routine go on undisturbed. Whether that holds is for you to judge; the timing is exact either way.

How this calendar is computed

Each void starts at the last exact conjunction, sextile, square, trine, or opposition the Moon makes to the Sun, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, or Pluto while in a sign, and ends at the Moon's ingress into the next sign. Both instants come from the same ephemeris that computes every chart on this site, checked against NASA JPL reference positions, and are found by bisection to well under a second. Astrologers who count only the Sun through Saturn get voids that begin earlier or at the same moment, never later. The nodes, asteroids, and chart angles are not counted, and the applying and separating minor aspects some calendars include are left out. Times are universal time; the browser converts them to your time zone. The method is described on the methodology page.

Reading the table

A void of a few minutes means the Moon perfected its last aspect just before changing sign; a void of a day and a half means the sign's aspects came early. Both are ordinary. The sign the Moon enters ends the void, and the moon phase and full moon calendar pages carry the rest of the month's lunar timing.