Fixed stars move so slowly that they preserve constellation patterns across a lifetime, but their tropical zodiacal longitudes change over centuries through precession and their own proper motion. A professional natal calculation therefore uses the birth epoch rather than copying a present-day star table.
Read three separate evidence lanes
- Begin with the Swiss-calculated stellar longitude, latitude, and visual magnitude at the natal Julian day.
- Measure the shortest ecliptic-longitude distance to each traditional planet, the Ascendant, and the Midheaven.
- Preserve Ptolemy’s named stellar locator and planetary quality analogy as historical source testimony.
- Keep birth-time-sensitive angle distances visibly qualified when the entered time is approximate or unknown.
- Return close distances to the wider nativity without making the star a planet or a score.
Why Stelliums does not declare an automatic conjunction
Ptolemy Book I chapter 9 describes the qualities of stellar regions and several named bright stars, but this passage does not supply one universal natal orb. Stelliums therefore sorts exact distances and labels under-one-degree and one-to-three-degree inspection bands without converting either threshold into historical eligibility.
Governed worked example
Worked example: Regulus near a natal point
In the frozen geometry fixture, Regulus is at 29 degrees 48 minutes Leo and the natal Sun is at 0 degrees 18 minutes Virgo. The shortest circular longitude distance is 30 minutes, so the row appears in the under-one-degree inspection band. Ptolemy associates Regulus with Mars and Jupiter, but the calculation stops at distance and source analogy.
- Star: Regulus, the bright star upon the heart of Leo.
- Natal point: Sun at the beginning of Virgo.
- Shortest longitude distance: 0.50 degrees across the sign boundary.
- Inspection band: under one degree.
- Permitted conclusion: close measured longitude proximity with a Mars-and-Jupiter historical analogy.
- Excluded conclusions: automatic conjunction, prominence rank, benefit, harm, office, fame, or event.