Void of Course

Definition

Void of course is a condition — most often talked about for the Moon — in which a planet, having just left its last exact aspect behind, will make no further exact aspect (no partile aspect) to any other planet before it leaves the sign it is in. The reckoning runs to the edge of the sign: aspects already completed inside the sign no longer count, and any aspect that would only become exact after the planet has crossed into the next sign is left out of the count.

In Tradition

In Western traditional and horary practice, a void-of-course planet is read as weakened in its power to carry things through: with no aspect left to complete inside its current sign, its "course is empty" of further connections. Astrologers agree the doctrine comes from medieval Arabic-Latin horary astrology and matters most for the Moon, the universal co-significator. They differ on whether to measure the void interval strictly to the sign edge or stretch it by orb across the cusp.

In Practice

To work out the void interval, you find the Moon's last exact aspect within its current sign and the moment the Moon moves into the next sign; the time between is the void window. In a horary question — one answered from the chart of the moment it is asked — a question asked while the Moon is void of course is usually read with the old maxim "nothing will come of the matter": the matter loses momentum, fails to complete, or runs on with no real change. In electional work, where the astrologer picks a good moment to start something, a void Moon is generally avoided for beginnings meant to grow into a lasting result. In a birth chart, a planet void of course is read as expressing its themes with less outward connection or social grounding.

Historical Origin

The doctrine appears in the medieval Arabic tradition — Al-Biruni's Tafhim §504 defines vacuus cursu as the planet "moving without any companion" — and is set out in full in Bonatti's Liber Astronomiae (Vol XI Tract III, on evacuatio cursus). Lilly fixed it for the English horary tradition in Christian Astrology (1647). Firmicus Maternus uses the parallel Greek term cenodromon. Modern Western traditional revival keeps the doctrine alive through Frawley and Louis.

Further Reading