Twelfth-parts, also called dodekatemoria, project the exact degree within a natal sign through a finer zodiacal sequence. They are a derived layer of the nativity, not extra planets and not a replacement chart. Stelliums keeps every result beside the planet’s original longitude.

Why two results appear

The surviving tradition is not uniform. The Dorothean sign-start method multiplies the degrees within the natal sign by twelve and counts that arc from the beginning of the sign. Paulus preserves a thirteenfold version; because the first copy of the within-sign distance returns to the natal point, this can also be understood as adding twelve times that distance to the original point.

• Dorothean sign-start: sign start + 12 × degrees within the natal sign.
• Paulus point-origin: sign start + 13 × degrees within the natal sign.
• Normalize every result into the 360-degree tropical zodiac.
• Locate the derived longitude in the original natal Whole Sign frame; do not calculate new angles or sect.

How to inspect the layer

• Establish the natal chart, sect, rulers, and planetary condition first.
• Open the comparative workbench and keep the natal position visible.
• Name the projection method whenever citing a derived placement.
• Inspect the derived sign, natal-frame place, and sign ruler as additional testimony.
• Return to the natal evidence before making a synthesis.