Void of Course

greek: Κενοδρομία (Kenodromia) · latin: Cursus Vacuus

Definition

Void of course describes a quiet stretch in the Moon's motion: the Moon has made its last aspect in the sign it is in and will make no further major aspect to any planet before it crosses into the next sign. The Greek term, kenodromia, literally means "empty-running"; the Arabic transmission keeps it as al-khali al-sayr, and the Latin tradition calls it cursus vacuus. Lilly's 1647 wording is what gave the term its place in English horary astrology — the branch cast for specific questions.

In Tradition

Across Hellenistic, Arabic-Persian, and traditional Western astrology, a void-of-course Moon is treated as a telling timing-state for horary and electional work — choosing the moment to begin something. The old rule of thumb is that "nothing will come of the matter" started while the Moon is void. It marks an in-between, aspectless interval, and things set in motion during it tend to lack traction. The ancient Greek kenodromia and the medieval Arabic-Latin sources form one continuous line of the same doctrine.

In Practice

You work out the Moon's position and check whether any further major aspect — conjunction, sextile, square, trine, or opposition (the five Ptolemaic aspects) — will become exact within the usual orb before the Moon leaves its current sign. If none will, the Moon is void of course. In a horary chart, a void Moon at the moment the question is asked usually means no clear judgment can be given, or that the matter simply will not move forward. In electional work, astrologers avoid void-of-course stretches for starting anything important — with one well-known exception that Lilly preserved: a void-Moon election is acceptable when the matter itself is better served by inaction. Standard modern practice uses the traditional Ptolemaic aspects and leaves the minor aspects out.

Historical Origin

The doctrine appears in Hellenistic technical writing as kenodromia in Vettius Valens' Anthologiae (c. 145-175 CE) and in later Greek horary sources. It carried through the Arabic-Persian transmission via Sahl ibn Bishr, Masha'allah, and al-Biruni's Kitab al-Tafhim, and was set down in the medieval Latin horary tradition by Bonatti's Liber Astronomiae (c. 1277). William Lilly's Christian Astrology (1647) gave it lasting currency in English horary, and the late-20th-century traditional revival has secured its place in modern practice.

Definition

In Tradition

In Practice

Historical Origin

Further Reading