What this asteroid chart shows
The four results are apparent geocentric positions: where each body appears in the zodiac when viewed from Earth at the selected instant. The calculator uses the tropical zodiac and the true equinox of date. It shows longitude, latitude, distance, and the sign of daily longitudinal motion. A negative speed is labeled retrograde.
Ceres, Pallas, Juno, and Vesta move much more slowly than the Moon or the Ascendant. A missing clock time therefore usually changes their degree only slightly during one date. The uncertainty panel still checks the full local day instead of pretending that noon is the recorded birth moment.
Why the wheel has only four points
This focused tool isolates the four classical major asteroids so their positions can be read without a crowded chart. It does not calculate houses, the Ascendant, or aspects to planets. Open the birth chart calculator separately and compare exact longitudes when you want to see whether an asteroid is close to the Sun, Moon, a planet, or an angle.
The aspect list measures only pairs among the four asteroids. It uses conjunction, sextile, square, trine, and opposition with a fixed 3° orb. The actual separation and distance from exactness are printed so the reader can judge the geometry before using the interpretive prompt.
A practical reading order
- Start with the asteroid’s sign and exact degree.
- Note whether its motion is direct or retrograde; avoid treating retrograde as automatically negative.
- Compare the degree with planets and angles in a complete chart.
- Read the house only from a reliable timed chart using the same zodiac and house method.
- Use the mythology as a question generator, then check the question against the rest of the chart and lived context.
Calculation method and limits
The local browser combines Earth’s embedded VSOP87D series with Chebyshev fits for 1 Ceres, 2 Pallas, 3 Juno, and 4 Vesta. The small-body fits were derived from JPL Horizons and cover 1600–2484; this interface deliberately limits entries to 1800–2100. Light time, precession, annual aberration, and nutation are included in the apparent-position pipeline. The download records decimal values with extra digits for comparison; the on-page zodiac position is rounded to the nearest arcminute.
The calculation is astronomy. The meanings attached to the names are astrological interpretation. A displayed position does not measure personality, diagnose a relationship, or predict an event.
Ephemeris references
- NASA/JPL Horizons provides high-precision solar-system ephemerides and the independent comparison values used by the calculator tests.
- JPL Small-Body Orbits and Ephemerides explains the small-body database and Horizons route.
- Caelus 0.24.1 supplies the MIT-licensed local apparent-position core and fitted tables.
- NASA Dawn mission documents the spacecraft study of Vesta and Ceres.