Free Fixed Stars Calculator

Fixed stars are distant suns that appear nearly stationary relative to the tropical zodiac. Unlike planets, which orbit the Sun and move through the signs over weeks or years, fixed stars shift only about 1 degree every 72 years due to the precession of the equinoxes. When a fixed star closely conjuncts a natal planet or angle, it adds a powerful additional layer of meaning.

The tradition of interpreting fixed stars reaches back to Babylonian astrology and was refined by Ptolemy, who cataloged stellar influences by assigning each star a “planetary nature.” For example, Regulus carries a Mars-Jupiter nature, combining ambition with authority. This system remains the foundation of fixed star interpretation today.

Our calculator checks 122+ named stars including all four Royal Stars (Aldebaran, Regulus, Antares, Fomalhaut), the 15 Behenian stars used in medieval talismanic magic, and dozens of traditional stars referenced by Ptolemy, Robson, and Brady. Positions are precession-corrected using NASA's ANISE toolkit and JPL ephemerides for arc-second accuracy. Browse all 122 stars for individual interpretations, mythology, and conjunction guides, or read our introduction to fixed stars.

Start with the conjunctions tab. These show fixed stars within orb of your natal planets by ecliptic longitude. Stars are sorted by tier: Royal Stars carry the strongest influence, followed by Behenian stars, then traditional stars. Tighter orbs mean stronger contacts: a 0.2° conjunction is far more significant than one at 1.5°.

Parallels of declination occur when a planet and star share the same celestial declination (distance north or south of the celestial equator). Parallels act like conjunctions and are especially important for stars far from the ecliptic that rarely make longitude conjunctions. Stars like Sirius (declination −16°) are more likely to contact planets through declination than ecliptic longitude.

Parans are calculated for your specific birth latitude and require an exact birth time. A paran occurs when a star and planet are simultaneously on key points (rising, setting, culminating, or at the nadir). Brady's paran method is considered the most accurate way to assess fixed star influence because it accounts for the star's actual position in the sky rather than its projected ecliptic longitude.