Fixed Star Conjunction Calculator
Enter a zodiac position and this tool will find nearby major fixed stars using an adjustable orb and year-based precession.
What is a fixed star calculator?
A fixed star calculator helps you compare a zodiac position (for example, a planet in your natal chart) with the ecliptic longitudes of well-known stars such as Regulus, Spica, Antares, Aldebaran, Sirius, and Fomalhaut. In traditional astrology, conjunctions to fixed stars are treated as amplifiers: they can add symbolism, intensity, or emphasis to the planet or angle involved.
This tool is focused on one practical question: Which fixed stars are close to my chosen degree? You control the orb (distance threshold) and year, so you can keep your calculations transparent and repeatable.
How this calculator works
1) Convert your input to absolute longitude
Zodiac positions are mapped to a 0-360° circle. For example, 15° Leo becomes 135° total longitude (Leo starts at 120°, then add 15°).
2) Apply yearly precession offset
Fixed stars shift slowly through tropical zodiac degrees due to precession. This calculator uses a simple mean annual rate (about 50.29 arcseconds per year) to move star longitudes from a base epoch to your selected year.
3) Measure angular distance
The script computes the shortest distance around the zodiac wheel and reports stars within your chosen orb. If nothing is inside the orb, it still returns the nearest stars so you have context.
How to use the results in chart interpretation
- Keep orbs tight: Many astrologers use 1° or tighter for fixed stars, especially for subtle effects.
- Prioritize major points: Conjunctions to the Sun, Moon, Ascendant, Midheaven, and chart ruler are usually read first.
- Check repetition: A single conjunction is interesting, but repeated themes across planets, houses, and aspects are more convincing.
- Stay contextual: A star does not replace the natal chart; it modifies what is already present.
Common stars and traditional themes
Below are broad, traditional keywords often associated with major stars. Interpretations vary by school and source:
- Regulus: leadership, visibility, honor, ambition.
- Spica: talent, gifts, refinement, support.
- Antares: intensity, courage, extremes, strategic drive.
- Aldebaran: integrity, initiative, achievement through action.
- Fomalhaut: ideals, vision, inspiration, artistic or spiritual pull.
- Sirius: brilliance, prominence, high output and strong will.
Tropical vs. sidereal note
This page uses a tropical zodiac framework for star-longitude matching. Different software and traditions may use slightly different reference catalogs, epochs, or calculation methods. If your values differ by small amounts from another tool, that is usually due to star catalog choices and precession model details.
FAQ
Why does my result differ from another fixed star app?
Differences typically come from star data source, epoch assumptions, and precession model precision. A small variance is common.
What orb should I use?
Start with 1.0° for strict work, then test up to 1.5° if you want a broader scan. Wider orbs produce more hits but less specificity.
Can I use this for transits too?
Yes. Enter the transit position you care about and inspect nearby stars for that year. For deeper analysis, compare transit-star conjunctions with natal planets and angles.
Final thoughts
A good fixed star calculator gives you quick, clean geometry. Good interpretation then comes from synthesis: chart context, timing, and real-life pattern recognition. Use the output here as a precision layer in your broader astrology workflow.