What are fixed stars in astrology?
Fixed stars are the individual named stars beyond the planets — Regulus, Spica, Algol, and others. When a planet sits on one, it takes on that star's ancient, vivid meaning, adding a mythic layer to the placement.
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Fixed Star Conjunctions Calculator
Free fixed star calculator: see which planets in your birth chart conjoin major fixed stars like Regulus, Spica, Algol, and Aldebaran, precessed to your birth year.
What a fixed-star conjunction adds
The planets carry the psychology of a chart; the fixed stars carry its myth. When a planet sits within about a degree of a bright named star, it borrows that star's ancient reputation — Regulus lends leadership, Algol lends raw intensity, Spica lends a gift. The brighter the star, the louder the theme, which is why the classical tradition tracks only a few dozen of them.
The stars this calculator checks
It checks your planets and angles against the twenty stars astrologers use most, including the four Royal Stars that once guarded the seasons — Aldebaran, Regulus, Antares, and Fomalhaut — plus Spica, Algol, Sirius, Vega, and Altair. A contact within about a degree and a half of exact is treated as a conjunction and shown with the star's core meaning.
How the positions are calculated
Each star is stored at its year-2000 zodiac position and then moved forward by precession — roughly fifty arcseconds a year — to the position it held in your birth year. That correction matters: over a lifetime a star shifts by most of a degree, enough to make or break a tight conjunction, so a fixed-star reading is only reliable when it is precessed to your birth.
Questions
Which fixed stars does this cover?
It covers the twenty most-used stars in astrology, including the four Royal Stars (Aldebaran, Regulus, Antares, and Fomalhaut), Spica, Algol, Sirius, and Vega, checked against every planet and both angles.
Why does my birth year matter?
Fixed stars drift forward through the zodiac by precession — about one degree every seventy-two years — so this calculator positions them for your birth year rather than a fixed date.