How should a chart handle a planet near a sign boundary?
A boundary-sensitive result should retain the unrounded longitude, frame, uncertainty interval, numerical precision, and distance to the boundary. If plausible input or model variation crosses that boundary, the sign label is unstable and should be reported as such rather than forced by display rounding.
Direct answer
A boundary-sensitive result should retain the unrounded longitude, frame, uncertainty interval, numerical precision, and distance to the boundary. If plausible input or model variation crosses that boundary, the sign label is unstable and should be reported as such rather than forced by display rounding.
Practical use
What to do with this answer
Test the calculation across the allowed time and model interval. Downstream rules conditioned on a sign should be withheld whenever the sign itself is not stable.
Distinctions to preserve
- Displayed degree versus retained longitude
- Numerical rounding versus input uncertainty
- Boundary crossing versus interpretive importance
Limitations
- A stable label does not establish a stable prediction.
- Uncertainty ranges depend on declared input and model assumptions.
Authority graph
Which existing contracts carry the answer
These linked pages carry the underlying definition, method, or tradition record and its own sources. This page preserves their boundaries rather than becoming a new source of independent authority.
Zodiac sign boundary sensitivity →
Establishes: A sign is a floor-based classification of normalized longitude into twelve 30° intervals; the continuous longitude is the underlying calculated fact.
Boundary: A stable sign classification does not make its interpretation empirically supported.
Numerical precision, rounding, and uncertainty →
Establishes: Precision describes representation; uncertainty bounds plausible error from inputs, models, data, and transformations. They are not interchangeable.
Boundary: More decimal places do not imply better source evidence or predictive performance.
Sun ingress calculation reference →
Establishes: A Sun ingress is a root of the signed angular distance between its declared geocentric ecliptic longitude and a selected 30-degree zodiac boundary. Solar ingress is the longitude of the apparent geocentric Sun crossing a zodiac boundary; it is not the Sun physically entering a constellation.
Boundary: The crossing does not establish that a new life or business phase begins, that an event will occur, or that Sun causes an outcome.
Equivalent questions
These query forms resolve to this same answer identity; they are not separate claims.
- What if a planet is on a cusp?
- Can rounding change a zodiac sign?
- How close to a sign boundary is uncertain?
- Should cusp planets have two signs?
Non-claim
This answer is a method or tradition description. It is not a personalized reading and does not certify predictive validity, causation, medical outcomes, legal status, investment value, or guaranteed events.