The draconic chart
The zodiac measured from the Moon's north node — a modern technique
The draconic chart re-zeros the zodiac at the Moon's north node (the 'dragon's head', hence draconic), a frame tied to the eclipse cycle rather than the equinox. Charles Harvey and, especially, Pam Crane developed the modern technique; Dennis Elwell's 1977 Cambridge lecture was the acknowledged starting point for Crane's study of it.
What it measures
A rigid rotation of every longitude so the north node sits at 0° Aries. Because the whole wheel turns together, the aspects between planets are unchanged — only their sign and house framing shifts.
Sources
- Pam Crane, The Draconic Chart