Which Zodiac system is used in the Sidereal Charts?

Last Updated: Jun 12, 2025

1. Fagan-Bradley Ayanamsha:

• Uses 12 zodiac signs
• Equal 30° divisions
• Western sidereal tradition
• Fixed star Spica at 29°06 Virgo

2. True Sidereal (Midpoint System):

• Uses 13 zodiac signs including Ophiuchus
• Unequal sign sizes based on actual constellation boundaries
• Uses midpoints between constellations as boundaries
• Reflects real sky positions and constellation sizes

Example of Tropical Astrology Chart (E.g. Sun in Capricorn)

Example of Sidereal (Fagan/Bradley) Astrology Chart (E.g. Sun in Sagittarius – Signs shift)

Example of True Sidereal Astrology Chart with the 13th Sign Ophiuchus

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