Void of Course

Void of course (VOC) describes the condition of the Moon after it has made its last major aspect to another planet and before it enters the next zodiac sign. William Lilly (Christian Astrology, 1647) defined the void-of-course Moon as one of the primary negative testimonies in horary astrology, famously stating that a void Moon signifies that "the thing sought after shall not come to perfection" — the matter performs nothing. In Lilly's horary practice, a void Moon at the time of a question indicated that events would not develop as hoped: the querent would not achieve what they sought, or the situation would drift without resolution. The void period can last from minutes to more than two days depending on the Moon's speed and the density of planetary aspects remaining in a sign. Modern astrologers maintain much of Lilly's counsel in practical terms: the void Moon is considered an unfavorable time to launch projects, sign contracts, or make consequential decisions. Conversely, it may be well-suited for rest, routine tasks, meditation, creative free play, or activities whose outcome does not depend on a specific result. The exact timing of void periods requires an accurate ephemeris, since even a brief applying sextile will end the void condition. Not all modern astrologers count minor aspects in defining void conditions; the classical definition uses only the five major Ptolemaic aspects.