True Sidereal (MTZ midpoint)

True Sidereal is a constellation-aware approach that uses midpoint boundaries between constellations, rather than equal 30° segments.

Why it exists

Classical sidereal systems apply a precession offset but still divide the zodiac into equal 30° signs. True Sidereal aims to reflect varying constellation spans along the ecliptic.

What changes in practice

• Boundaries are not assumed equal in size.
• Ophiuchus may appear as an additional constellation.
• Degree‑in‑sign reflects the real segment you’re in.